coaxv.哄，哄劝

　　metabolicadj. 代谢的

　　注释：

　　2. quadrupedal andbipedal：quad-：构词词素，是四的意思;bi-：构词词素，是二的意思; ped-：构词词素，是脚的意思;-al是构成形容词的后缀，表示的。因此，quadrupedal 意为凹足动物的，bipedal意为二足动物的。

　　练习：

　　A Tile evidence why chimpanzees can be trained to use treadmills.

　　C The evidence why our apelike ancestors came to walk on two legs.

　　2. Which of the following best interprets the meaning of While the chimps

　　A While the chimps worked in the lab ...

　　C While the chimps tried to figure out what they should do ...

　　3. What was the result of the finding，according to Paragraph 5?

　　B One chimp used less energy walking on two legs.

　　D All of the above.

　　A Our apelike ancestors were anatomically different but had the same gaits.

　　C Our apelike ancestors could adapt to different climate changes due to genetic variation.

　　5. What does fossil and molecular evidence tell us about our earliest ancestors?

　　B Due to changes in climate，they were forced to travel between food patches.

　　D They could travel longer distances on the ground than those who could use less energy.

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