A While the chimps worked in the lab ...

　　B While the chimps exercised in the gym ...

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

　　D While the chimps tried to understand the instructions ...

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

　　A Three chimps used more energy walking on two legs.

　　B One chimp used less energy walking on two legs.

　　C One chimp used about the same energy walking on two legs as on four.

　　D All of the above.

　　4. What was true of the hypothesis of the research?

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

　　B Bipeds with natural selection had an advantage over quadruped.

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

　　D Bipeds had an advantage over quadrupeds due to changes in the environment.

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

　　A They experienced more climate changes than we do today.

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

　　C They could cover more ground than their quadrupedal peers because they used less energy.

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