大学英语4课后习题答案
Unit 7
Section A. Research into Population Genetics
《读写教程 IV》: Ex. II, p. 178
1. The book concludes that despite surface features, the “races” are remarkably alike under the skin.
2. Luca Cavalli-Sforza, a Stanford professor, and his colleagues.
3. In human blood: various proteins that serve as markers to reveal a person’s genetic makeup.
4. Because they share such superficial characteristics as skin color and body shape. But the discoveries indicate that Australians are most distant from the Africans and most closely resemble the Southeast Asians.
5. It confirms that Africa was the birthplace of humanity and thus the starting point of the original human movements.
6. Their genes show the Khoisan may be a very ancient mix of west Asians and black Africans, rather than being directly descended from the most primitive human ancestors.
7. All Europeans are thought to be a mixed population, with 65% Asian and 35% African genes.
8. It is the latest raw material of the medical industry. And in addition, it can be used to weaken conventional notions of race that cause racial prejudice.
《读写教程 IV》: Ex. III, p. 178
1. discounted
2. biased
3. variation
4. feature
5. Confronted
6. migrated
7. descended
8. exploiting
《读写教程 IV》: Ex. IV, p. 179
1. The scientists announced last year that one of the genes that played a part in determining the intelligence had been identified, but to date the results have yet to be confirmed.
2. They seem to think that building a new road will improve the traffic problem, but in effect, it will make it worse.
3. It’s amazing that the scientists created nothing less than the first genetic map of the world.
4. As of today Dr. Carey will be in charge of a long-term study of children who are unusually good at math.
5. The best way to lose weight is proper diet in combination with regular exercise.
6. Many women in the city have taken low-paid, so-called part-time work in addition to their child-rearing and community care activities.
7. Their research into better parenting and educational techniques sheds new light on the fact that more boys have unusual mathematical abilities than girls.
8. It is now known that this illness is not only confined to any one group in society.
《读写教程 IV》: Ex. V, p. 179
1. secret
2. experiences
3. characteristics
4. idea
5. information
6. success
7. prejudices
8. equality
《读写教程 IV》: Ex. VI, p. 180
1. privacy
2. intimacy
3. frequency
4. fluency
5. secrecy
6. urgency
7. consistency
8. dependency
《读写教程 IV》: Ex. VII, p. 181
1. politics
2.
classics
3. electronics
4. economics
5. psychology
6. methodology
7. technology
8. biology
《读写教程 IV》: Ex. VIII, p. 182
1. Being healthy is more than a question of not being ill.
2. I was more than a little put out; I was totally shocked.
3. This story is more than interesting; it is educational, as well.
4. Hepworth is much more than a filmmaker; he had learnt to find stories that would have genuine popular appeal.
5. It was more than a misjudgment: it revealed the extent to which the religious intellectuals’ theory of the church was outdated.
《读写教程 IV》: Ex. IX, p. 182
1. What was needed was nothing less than a new industrial revolution.
2. This is nothing less than a call to arms to restore the vitality of the American dream.
3. Their dream was nothing less than a revolutionary project to bring computers and ordinary people together.
4. The experience of sightseeing in the wonderful island is nothing less than exciting and I am moved to tears.
5. He was much concerned that she should not be tired, or bored and he wanted to make sure that the holiday would be nothing less than perfect for her.
《读写教程 IV》: Ex. X, p. 182
1. We have received three anonymous letters from Palestine to date, in addition to one suspicious package.
2. Their dream was nothing less than a more equal society where there is no racial prejudice.
3. He read more than Shakespeare’s plays; he liked modern music.
4. His fate in the last election, she said, would serve as a reminder to all politicians that popularity does not last.
5. In effect, only hard work in combination with proper methods will always give you an advantage over others in study.
6. Technology itself, and its effective use, is not to be confined to the traditional science subjects.
7. Since the truth of this report was discounted, I was not in a position to publish it for you.
8. Many software companies have adapted general programs to the new operating system.
《读写教程 IV》: Ex. XI, p. 183
1. 它对人类在基因层面上的差异作了迄今为止最为广泛的调查。
2. 实际上，那种认为某一种群比另一种群的基因更优越的理论是毫无科学根据的。
3. 为了确保种群的“纯正”，这项研究将对象限定于其目前的生活区域仍与1492年以来相同的那些群体，即在来自欧洲最初的大规模迁移之前。这实际上就是一幅真实的哥伦布驶向美洲时期的世界人口基因分布图。
4. 我们眼中看到的人种差异，例如欧洲人与非洲人的差异，主要是人类从一个大陆向另一个大陆迁移时为适应气候所产生的。
5. 结合对远古人骨的研究，这一图谱证实了非洲是
人类的诞生地，因而也是人类迁移的始发地。
6. 这些发现，再加上现代非洲人与非非洲人之间的巨大基因差距，说明了从非洲人种群开始的分支是人类家谱上最早的分支。
7. 除了揭示人种的起源以外，基因信息也是医学界可用的最新原料。医学界希望能用人类脱氧核糖核酸（DNA）制成特别的蛋白质，这些蛋白质具有某种抗病药物的价值。
8. 保护土著人权益活动家们担心科学家可能会利用土著人谋利：从当地人血样中提取的基因物质可被用于商业目的，却不给DNA提供者以足够的报酬。
Section B. Geniuses and Better Parenting
XVI. Choose the best answer to each of the following questions
1. B 2. C 3. B 4. A 5. B 6.C 7. B 8. C
《读写教程IV》Ex. XVII, p. 193
1. supervised
2. fatigue
3. guarantee
4. explore
5. sophisticated
6. identified
7. steer
8. beneficial
《读写教程IV》Ex. XVIII, p. 193
1. up
2. out
3. up
4. in
5. over
6. up
7. in
8. into