5.1 课时作业
Ⅰ.用所给词的适当形式填空
1．He ________ (chase) the burglar but couldn't catch him.
2．A novelist ________ (create) characters and a plot.
3．They've ________ (destroy) all the evidence.
4．The animals were ________ (terrify) by the storm.
5．At that time in Southern States, blacks were not ________ (treat) as equal citizens.
6．He was put into prison because he ________ (murder) an old lady.
7．I asked him to show me the record that was kept of the meeting, but he ________ (refuse)．
8．Seeing a car coming on, I ________ (rush) to carry the child to the roadside.
9．His ________ (wrinkle) face tells us that he has suffered a lot in his life.
10．I felt ________ (disgust) when I saw the woman was showing off her wealth.
答案：1.chased 2.creates 3.destroyed 4.terrified
5．treated 6.murdered 7.refused 8.rushed
9．wrinkled 10.disgusted
Ⅱ.阅读理解
A
From the moment that an animal is born, it has to make decisions. It has to decide which of the things around it are for eating, and which are to be avoided; when to attack and when to run away. The animal is，in fact，playing a very dangerous game with its environment, a game in which it must make decision—a matter of life or death.
Animals' ability to act reasonably is believed to come partly from what we may call “genetic (遗传性的) learning”， which is different from the individual (个体的) learning that an animal does in the course of its own lifetime. Genetic learning is learning by a species—animals of the same kind—as a whole, and it is achieved by
