《分式四则运算》热点专题高分特训(含答案)
分式四则运算（人教版）一、单选题(共11道，每道9分)
1.化简的结果为( )
A.1
B.
C.
D.
答案：B
解题思路：
故选B.
试题难度：三颗星知识点：分式的乘除运算
2.化简的结果为( )
A. B.a C. D.
答案：A
解题思路：
故选A．
试题难度：三颗星知识点：分式的乘除运算
3.化简的结果为( )
A. B.
C. D.
答案：C
解题思路：
故选C．
试题难度：三颗星知识点：分式的乘除运算
4.化简的结果为( )
A.-2
B.2
C. D.
答案：A
解题思路：
故选A.
试题难度：三颗星知识点：分式的乘除运算
5.的最简公分母是( )
A. B.
C. D.
答案：D
解题思路：
试题难度：三颗星知识点：最简公分母
6.在通分过程中，不正确的是( )
A.最简公分母是
B.
C. D.
答案：B
解题思路：
，选项B错误，
故选B．
试题难度：三颗星知识点：最简公分母
7.化简的结果为( )
A. B.
C. D.
答案：B
解题思路：
故选B．
试题难度：三颗星知识点：分式的加减运算
8.( )
A. B.
C. D.
答案：B
解题思路：
故选B．
试题难度：三颗星知识点：分式的混合运算9.( )
A.1
B.
C. D.
答案：A
解题思路：
故选A．
试题难度：三颗星知识点：分式的混合运算
10.( )
A. B.
C.1
D.-1
答案：C
解题思路：
故选C．
试题难度：三颗星知识点：分式的混合运算
11.已知，分式的分子分母都加上1，所得分式的值相比( )
A.增大
B.减小
C.不变
D.无法确定
答案：A
解题思路：
试题难度：三颗星知识点：分式的加减运算
七年级上册英语课时特训答案外研版第二单元
七年级上册英语课时特训答案外研版第二单元 Starter Module 2 Unit 1答案 一、1 - 4 B G C D 5 - 7 F E H 二、1 - 4 D A C B 三、1、please 2、book 3、draw 4、listen 5、stand 6、close 四、略 五、1、put up your hand 2、sit down 3、stand up 4、close your book 5、open your book Starter Module 2 Unit 2答案 一、1、陈老师的班 2、a new student 3、电话号码 4、sit down 5、What class 6、stand up
7、合上你的书本 8、举起你的手 9、Class Three 10、my English lesson 二、zero ， one ， two ， three ， four ， five ， six ， seven ， eight ，nine ， ten 三、1、two five one ， three eight zero 2、our seven six ， five eight nine 3、one eight nine ， six five seven 4、three eight six ， seven five two 四、1、four ， six 2、two ， four 3、five ， seven 4、one ，three 5、six ， eight 6、seven ， nine 7、eight ， ten 8、three ， five 五、1、011357 2、two eight seven four nine 3、1350570 4、five seven six eight four one three 5、3996435 六、1、what's ， It's ， telephone number 2、My number ， telephone number
第四章 练习题及参考答案
第四章 静态场的解 练习题 1、设点电荷q 位于金属直角劈上方，其坐标如右图所示，求 （1） 画出镜像电荷所在的位置 （2） 直角劈内任意一点),,(z y x 处的电位表达式 （3） 解：（1）镜像电荷所在的位置如图1所示。 （2）如图2所示任一点),,(z y x 处的电位为 ??? ? ??-+-= 4321011114r r r r q πεφ 其中， ()()()()()()()()2 22422 232 2222 22121212121z y x r z y x r z y x r z y x r +-++= ++++=+++-=+-+-= 2、 两个点电荷Q +和Q -位于半径为a 的接地导体球的直径延长线上，距球心均为 d 。证明镜像电荷构成一位于球心的电偶极子，且偶极矩大小为232d Q a 。 证明：由点电荷的球面镜像法知，＋Q 和－Q 的镜像电荷Q Q ''',分别位于球内＋Q 和－ Q 连线上大小分别为Q D a μ，且分别距球心为D a 2（分别位于球心两侧）。可见Q Q ''',构 成电偶极子，由电偶极距的定义式得偶极距的大小为： 图1 图2 q - q +q -
2 322D Q a D a Q D a ql p =?==。结论得证。 3、已知一个半径为a 的接地导体球，球外一个点电荷q 位于距球心O 为d 处。利用镜像法求球外空间任意点的电位分布。 解：由点电荷的球面镜像法可知，q 的像电荷q '必定位于球内，且在q 与球心0连线上，位置在距离球心设为f 处。建立直角坐标系，由边界条件(?球）=0可取球面上两个特殊点B A ,讨论。B A ,是q 与球心0连线所对应的直径与球面的两个交点。由图示及点电荷的电位公式得： 0)(4)(4)(00=+' ++= f a q a d q A πεπε?， 0) (4)(4)(00=-' +-= f a q a d q B πεπε?。 解此方程组得：d a f q d a q 2 ,=-='。 所以任意场点),(y x P 处的电位为： r q r q ' '+ = 0044πεπε?。 其中r r ',分别是点电荷q 和q ' 到场点P 的距离。 值分别为21 2221 22])[(,])[(y f x r y d x r +-='+-=。 4、半径为a 的不接地导体球附近距球心O 为d （?d a ）处有一点电荷q ，用镜像法计算 球外任一点的电位。 解：由点电荷的球面镜像法可知，q 的像电荷除了有q '（即导体球接地时对应的结果， q d a q -='，其位置为d a f 2=），还在球心处有另外一个镜像电荷q ''，以保证导体球面电 势不为零的边界条件成立，且可知q q '-=''。 所以任意场点P 处的电位为： r q r q r q ' '''+ ' '+ = 000444πεπεπε?
高考英语完形填空高分特训100篇【圣才出品】
高考英语完形填空高分特训100篇 人物故事类 Cloze1 Last spring,I was fortunate to be chosen to participate in an exchange study program.In my application letter,I was careful to1how much I wanted to see France;evidently,my excitement really came through in my words.Once I2 that I was going,all I could think about was the fun of foreign travel and making all sorts of new and3friends.While traveling was inspiring and meeting people was4,nothing about my term in France was what I5. The moment I arrived in Paris,I was6by a nice French couple who would become my host parents.My entire experience was joyous and exciting7I received some shocking news from my program coordinator:there had been a death in my host parents’extended family.They had to travel outside France for several weeks.That afternoon,I had to8out of one family’s house into another.The exchange coordinator told me I’d have a9this time and asked whether I could share a bedroom with an English speaker.To avoid the temptation to10my native language,I asked not to be11with an English-speaking roommate.When I got to my new room,I12myself to my new roommate Paolo,a Brazilian the same age as I,whom I was surprised to find playing one of my favorite CDs!In just a few hours,we knew we’d be good friends for the rest of the
六年级英语课时训练答案
六年级英语课时训练答案 一. Listen and choose. 选出你所听到句子中含有的单词或词10分 （）1. Jim goes to Beijing ________ . A. by ship B. by subway C. by train （）2._______ at a red light. A. Stop B. traffic C. Wait （）3.How can I get to the ________ . A. hospital B. cinema C. post office （）4.I’m going to buy a ________ . A. post card B. magazine C. dictionary ( ) 5. Plant the _______ in the soil . A. seeds B. sprout C. plant 二．Listen and choose.（听问题，选答句）10分 ( ) 1. A. Turn left then go straight. B.I go to the museum by car. ( ) 2. A. She works in the bank. B. She goes to work by subway. ( ) 3. A. He likes collecting stamps. B. He is an accountant. ( ) 4.Ａ.She likes making kites. B. She is thin and pretty. ( ) 5.A. I’m going to buy a book.. B. I’m going this afternoon. 三．Listen and number. 听音排序10分 笔试部分（70分） 四．选出不同类的一项。（5分） （）1. A. bus B. bike C. train D. how （）2.A.cinema B.morning C. afternoon D. evening （）3. A. writer B. school C. teacher D. singer （）4. A. sun B. rain C. play D. cloud （）5. A. where B. who C. what D. hobby 五. 根据所给提示,把括号中的字母组合成合适的单词。(5分) 1、It comes from the clouds . It’s the . （inar ） 2、He plays in the film . He is an . ( tcaor ) 3、You can go to school by . ( ibek ) 4、Don’t turn right, please turn . ( eltf ) 5、Put some seeds in the soil, water them , in several days ,you can see a ( a t l p n ) 六、选择与图画相符的句子，并将图片的字母标号填到相对应的句子前面括号内。5 ( ) 1. My father goes to work by bike every day. ( ) 2. We’re going to make a card for Sarah. ( ) 3. He helps sick people. ( ) 4. Let's go to the Great Wall this weekend. ( ) 5. My aunt is an engineer. She works in a car company. 六．选择。(10分) ( ) 1. do you go to Shenzhen(深圳)，By bus or by car? A. What B. How C. When
中考综合模拟满分特训(五)正文
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One of them 8 food.All the 9 on space stations are put together on Earth and sent there by spaceship.Because the food has to last for a long time, a lot of it has to be stored in cans.The space station does not have a fridge, but it has a cool room to keep fruit and vegetables fresh. Astronauts also eat many other foods 10dried meat that do not need special care. 1.A.into B.with C.of D.on 2.A.or B.but C.unless D.if 3.A.ones B.one C.first D.one’s 4.A.found B.was built C.was brought D.built 5.A.them B.they C.its D.it 6.A.lived B.played C.took D.went 7.A.more B.shorter C.longer D.much 8.A.am B.is C.are D.be 9.A.apple B.vegetable C.meals D.meat 10.A.such asB.at last C.next too D.other than 二、阅读理解(共三节,满分35分) 第一节根据短文内容,判断下列句子的正误。正确的填“T”,错误的填“F”。(共5小题;每小题1.5分,满分7.5分) Disney has made many cartoon movies. The princesses(公主们)in the movies are often girls’ favorite characters. From Snow White to Moana,every princess leaves a deep impression(印象)on people. However, have you noticed that Disney princesses are changing? In the early Disney cartoon movies,princesses like Snow White,Cinderella and Aurora from Sleeping Beauty are usually good-looking and kind-hearted.But they have to depend on others to get out of trouble and find happiness. They end up living happily with their princes. Now,people still love those princesses, but more and more girls know they have to fight for their own happiness.Disney has noticed the change.So the princesses in its newer movies don’t just have good looks. Merida from Brave is a good example. She was born as a princess and she likes going on adventures(冒险). She spends her days practicing archery(射箭术), riding her horse and experiencing the world around her. She loves her family,but she wants to take control of her own life. Some time ago,Disney even put up th eir “10 new rules for being a mode rn princess”.The rules include: Car e for others; Live he althily;Don’t judge a book by its cover; Be honest, Be a friend you can trust; Believe in yourself; Right wrongs; Try your best; Be loyal and Never give up. None of the rules are about the looks of a princes s. Anyway,one’s inner beaut y is more valuable. Don’t you t hink so? 11.Snow White is a good-looking and kind-hearted girl.() 12.All Disney princesses can get out of difficulty and find happiness by themselves.() 13.The princesses in D isney’s newer movies jus t have good looks.() 14.Merida wants to take control of her own life.() 15.Disney has found it more valuable to have inner beauty than to just have good looks.() 第二节根据短文内容,从题中所给的A、B、C、D四个选项中,选出最佳选项。(共10小题;每小题2分,满分20分) A Many Chinese people will wonder what presents to get for their moms on Mother’s Day, but not many know Mother’s Day is actually a festival from overseas. Mothe r’s Day originated(起源)in America during the early 20th century. The festival spread to China as early as the 1980s and was widely accepted. Why did a foreign festival become popular in China? In fact, traditional Chinese culture has always encouraged filial(孝顺的)devotion to parents. There are many stories which show filial respect in ancient China. For example, the st ory of“Taste Liquid(液体的)Medicine for Mother”tells us the filial virtue(美德)of Emperor Wen of the Western Han dynasty. His mother had been sick for three years. He often stayed up by her bedside and cared for her day and night. He tasted the liquid medicine first before she drank it. Also, mother love is a repeated subject in ancie nt Chinese poems, like “Song of the Parting Son” by Meng Jiao, a poet of the Tang dynasty. Now this poem is still a must in the school textbooks. Children in China are brought up with the education of filial devotion. On special days, people often use roses or forget-me-nots to express love. Carnations are considered as the perfect flowers for mothers around the world, but few know that China has its own flower for mothers—the tiger lily. Love for mothers can have different ways of expression. What matters most is love, not the festival itself. What mothers truly want is perhaps just a simple expression of love from their children. 16.When did Mother’s Day spread to C hina?() A.In the 1920s. B.In the 1980s. C.In the Western Han dynasty. D.In the Tang dynasty. 17.Wh at is the poem of “Song of the Parting Son”mainly about?() A.The filial virtue of Emperor Wen. B.Caring for the old. C.Traditional Chinese medicine. D.A mother’s love for her son. 18.Mother’s Day is popular in Chi na mainly because of.() A.its wide spread in many countries B.our ancient stories of respecting parents C.our traditional cultural values D.its simple way of expressing love 19.What is regarded as the Chinese own flower for a mother?() 20.What a mother truly wan ts on Mother’s Day may be.() A.a big dinner B.a celebration party C.greetings of the festival D.expensive presents B Life is like the four seasons. Now I am very old, but when I was young, it was the spring of my life. I was born, I played a lot, and then I started school. I learned many new things. Like a flower, I grew bigger every day. There were happy days and sorrowful days: some days the sun shone, and some days it didn’t. In my twenties, I had a good job. I was strong and happy. Then I married and had a c hild. In those days, I didn’t h ave much time to think. Every day I was busy an d worked very hard. And so, I started to get som e white hairs. The summer o f my life passed quickly. Then the days got shorter. Leaves fell from the trees. My child was a university student, and then an engineer. My home was much quieter. I started walking more slowly. One day I stopped working. I had more time. I understood this was my autumn, a beautiful time when the trees change color and give us delicious fruits. But the days kept getting shorter and colder. Winter has come. I am older and weaker. I know I do not have many days left, but I will enjoy them to the end.
第四章 练习题
第四章练习题 一、单项选择题 1．对于财务报表及其附注披露充分性的主要责任由( )承担。 A．被分派去负责该业务的合伙人或主任会计师 B．对外勤工作负责的项目经理 C．编制该报表及其附注的会计人员 D．被审计单位的管理层 2．下列表述中，为获取适当的审计证据所实施的审计程序与审计目标最相关的是( )。A．从甲公司销售发票中选取样本，追查至对应的发货单，以确定销售的完整性 B．实地检查甲公司固定资产，以确定固定资产的所有权 C．对已盘点的甲公司存货进行检查，将检查结果与盘点记录相核对，以确定存货的计价的正确性 D．复核甲公司编制的银行存款余额调节表，以确定银行存款余额的正确性 3．注册会计师对财务报表审计并发表意见，旨在( )。 A．保证财务报表不存在重大错报 B．提出管理建议书，改进被审计单位的内部控制 C．发现财务报表中的重大舞弊行为 D．合理保证财务报表使用者确定已审财务报表的可靠程度 4．下列( )情况时，注册会计师应主要审查收入的截止目标。 A．将未曾发生的销售登记入账 B．将已发生的销售业务不登记入账 C．将下年度收入列入本期 D．将利息收入列入营业收入 5．注册会计师对一台“打桩机”的历史成本进行审查，这主要是为了证实管理层的( )认定。 A．存在B．完整性 C．准确性D．计价和分摊 6．注册会计师在审查应收账款时，发现账上某笔记录“借：应收账款-A公司l 000 000，贷：主营业务收入1 000 000”，通过函证A公司检查该笔销货记录，证实A公司实际欠款50万元。那么，注册会计师首先认为管理层对营业收入账户的( )认定存在问题。 A．发生B．完整性 C．准确性D．权利和义务 7．注册会计师在审查销售部门的销货合同时，发现与A公司有一笔50万元销售未入账，通过函证A公司，检查该笔销货记录，证实A公司实际已购货且欠款50万元。那么，注册会计师首先认为管理层对营业收入账户的( )认定存在问题。 A．发生B．完整性 C．准确性D．计价和分摊 8．注册会计师在审查应收账款时，发现账上某笔记录“借：应收账款-A公司1 000 000．贷：主营业务收入1 000 000”，通过函证A公司，检查销货记录等，证实根本未发生该笔销售业务。那么，注册会计师首先认为管理层对营业收入账户的( )认定存在问题。 A．发生B．完整性 C．准确性D．计价和分摊 9．被审计单位将固定资产已作抵押，但未在财务报表附注中披露，则注册会计师认为主要是( )认定存在问题。 A．完整性B．分类和可理解性
英语专业考研基础英语改错高分特训500句+100篇(第1~2章)【圣才出品】
英语专业考研基础英语改错高分特训500句＋100篇 第1章改错题技巧指南 对于绝大多数报考英语专业的考生而言，“基础英语”是全国各院校英语专业研究生入学考试必考的科目。一般来说，报考英语专业研究生的考核科目为：政治（分值100分）、第二外语（分值100分）、基础英语（分值150分）以及专业课（包括英美文学、语言学与应用语言学、翻译理论及实践等）（分值150分）。 需要说明的是，有些院校对此科目的考试名称有所不同：例如北京大学称之为“专业能力”，上海外国语大学称之为“英语综合”，北京外国语大学称之为“英语基础测试（技能）”，上海交通大学、广东外语外贸大学等称之为“英语水平考试”，四川大学称之为“英语专业基础”，山东大学称之为“实践英语”。上述院校的科目名称和大多数院校所用的“基础英语”名称虽有差别，但实质是一样的，都是由各学校自主命题、考核英语专业考生基本功底的考试科目。 1.1出题形式 “基础英语”的改错题主要考查考生运用语法、词汇、修辞等语言知识，识别所给短文或句子的语病并改正的能力。 出题形式主要有以下几种： ①给出一篇250词左右的短文，共10处标记，可能有错误也可能完全正确，要求考生根据“增添”、“删除”或“改变其中的某一单词或短语”三种方法中的一种改正语误。
②给出一篇短文，没有标记，要求考生删除10处多余的词，不一定每行文字都有错误，也不一定1行文字只有1处错误。 ③给出一篇短文，没有标记，要求考生根据“增添”、“删除”或“改变其中的某一单词或短语”三种方法中的一种改正语误。不一定每行文字都有错误，也不一定1行文字只有1处错误。 ④给出的为一个单句，句子中有四处标有下划线，要求考生选出有错误的一项。如： Tokyo Bay shook as if huge rug had been pulled from under it. A B C D ⑤给出的为一个单句，要求考生在错误处加下划线，并根据“增添”、“删除”或“改变其中的某一单词或短语”三种方法中的一种改正语误。 1.2常考错误类型 一、词法错误 词法错误主要包括了名词、动词、代词、冠词、介词、形容词副词的使用错误等，主要考察考生对常用词汇的词性、含义、用法的掌握。 （一）名词 改错中涉及到名词的错误主要有以下几类：名词“近义词”（形近或意近）、名词的单复数、可数名词与不可数名词、名词与动词、与形容词等词类的转换等。 1.名词近义词 英语中有许多拼写或读音相似甚至相同的词语，考生在平日学习时应注意这类词语的区分。
英语七年级上册课时特训答案
英语七年级上册课时特训答案 Starter Module 1 Unit 3 一、1、friend 2、she 3、teacher 4、spell 5、fine 6、meet 二、1、What is 2、My name is 3、I am 4、She is 5、His name is 6、Her name is 7、He is 8、It is 三、this is ， She ， Hello ， friend ， Her ， Nice to ， too ， to go ，See you 四、1、His 2、He 3、She 4、He ， my 5、your ，I 6、you ， you 7、Her
8、you 五、1 - 5 C B B A B 六、1、It's time to go now. 2、This is my friend ， Betty、 3、Can you spell it ， please? 4、What's your name? Starter Module 2 Unit 3 一、eleven ， twelve ， fourteen ， twenty ， eighteen ，fifteen ，seventeen ， nineteen ， thirteen ，sixteen 二、A、fifteen bags B、eleven chairs C、nineteen books D、twelve girls E、fourteen boys 三、one ， three ， five ， seven ，nine ， eleven ， thirteen ， fifteen ，seventeen、nineteen 四、1、fourteen 2、sixteen 3、Twelve 4、Eleven 5、Seventeen 6、thirteen 7、eighteen 8、Nine 五、1、What's your name ， Can you spell it ， How are you ， How old are you、years old ， What class ， Class Five
第四章练习题
第四章练习题 一、名词解释 资本成本：又称资金成本，是企业为筹集和使用长期资金而付出的代价。 边际资本成本：是指资金每增加一个单位而增加的成本。 二、单项选择题 1. 某公司财务杠杆系数等于1，这表明该公司当期（）。 A利息与优先股股利为零 B利息为零，有无优先股股利不好确定 C利息与息税前利润为零 D利息与固定成本为零 2. 只要企业存在固定成本，则经营杠杆系数必（）。 A与销售量成正比 B与固定成本成反比 C恒大于1 D与风险成反比 3. 某公司全部资本为150万元，负债比率为40%，负债利率为10%，当销售额为130万元时，息税前利润为25万元，则该公司的财务杠杆系数为（）。 A1.32 B1.26 C1.5 D1.56 4. 不存在财务杠杆作用的筹资方式是（）。 A发行普通股 B发行优先股 C发行债券 D举借银行借款5. 每股利润变动率相对于息税前利润变动率的倍数，即为（）。 A经营杠杆系数 B财务杠杆系数 C综合杠杆系数 D边际资本成本6. 某公司的经营杠杆系数为2，预计息税前利润将增长10%，在其他条件不变的情况下，销售量将增长（）。 A20% B10% C15% D5% 7. 在计算资本成本时，与所得税有关的资金来源是下述情况中的（）。 A普通股 B优先股 C银行借款 D留存收益 8. 经营杠杆效应产生的原因是（）。 A不变的债务利息 B不变的产销量 C不变的固定成本 D不变的销售单价 9. 债券的资本成本率一般低于股票的资本成本率，其主要原因是（）。 A债券的筹资费用较少 B债券的发行量少 C债券的利息率固定 D债券利息在税前支付 10.每股利润变动率相对于销售额变动率的倍数，即为（）。 A经营杠杆系数 B财务杠杆系数 C综合杠杆系数 D边际资本成本 三、多项选择题 1、下列项目中，属于资本成本中筹资费用内容的是（）。 A 借款手续费 B 债券发行费 C 债券利息 D 股利 2、财务杠杆效应产生的原因是（）。 A 不变的债务利息 B 不变的固定成本 C 不变的优先股股利 D 不变的销售单价 3、计算综合资本成本时的权数，可选择（）。 A 账面价值 B 票面价值 C 市场价值 D 目标价值 4、负债资金在资本结构中产生的影响是（）。
高考英语阅读理解高分特训100篇(说理小品类)【圣才出品】
说理小品类 Passage 1 The internet will open up new vistas (前景), create the global village—you can make new friends all around the world. That, at least, is what it promised us. The difficulty is that it did not take the human mind into account. The reality is that we cannot keep relationship with more than a limited number of people. No matter how hard the internet tries to put you in communication, its best efforts will be defeated by your mind. The problem is twofold（双重的）. First, there is a limit on the number of people we can hole in mind and have a meaningful relationship with. That number is about 150 and is set by the size of our brain. Second, the quality of your relationships depends on the amount of time you invest （投入）in then. We invest a lot in a small number of people and then distribute what’s left among as many others as we can. The problem is that if we invest little time in a person, our engagement with that person will decline （减弱）until eventually it dies into “someone I once knew”. This is not, of course, to say that the internet doesn’t serve a socially valu able function. Of course it does. But the question is not that it allows you to increase the size of your social circle to include the rest of the world, but that you can keep your relationships with your existing friends going even though you have to more to the other side of the world.
2018届高考英语第一轮课时训练29(ⅰ.单句语法填空)(有答案)
Ⅰ.单句语法填空 1．Open all the ________ (curtain) and turn up the lights.(2015·全国Ⅱ，阅读B) 2．________ (ignore) the difference between the two research findings will be one of the worst mistakes you make.(2015·安徽，27) 3．________(item) like T-shirts that allow volunteers to be recognized publicly for their contributions can help strengthen role identity.(2015·江苏，阅读C) 4．My only mistake was that I dropped some on the floor while I ________ (pack) them up. 5．She would push my dirty clothing over，and I would lay my books on her tidy desk.We both got tired ________ each other. 6．In his application for the volunteer job，the author went through ________(challenge) survival tests. 7．It was a rainy morning and the children，mainly boys with various learning difficulties，refused ________ (settle) for the start of the lesson. 8．If you're truly ________ (concern)，you'll know when your neighbor needs some cheering up—a bunch of flowers or a helping hand when it's needed. 9．A few people ________(agree) while most people ________(agree)，so no ________(agree) was made. 10．________(concern) the toll-free(免交通费) policy on the express way，what ________(concern) us most is the traffic jams while some ________(concern) about the safety. 答案 1.curtains 2.Ignoring 3.Items 4.was packing 5．of 6.challenging7.to settle 8.concerned9.agreed；disagreed；agreement10.Concerning；concerns；are concerned Ⅱ.单句改错(每句仅1处错误) 1．I wasn't doing anything on the purpose to make myself better. 2．I went to live there in order to being near him. 3．They have got the power to changing the world. 4．But then I guess I couldn't stand it longer.