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quadrupedal peers.
Taken together, the findings provide support for the hypothesis that anatomical (解剖学的) differences affecting gait existed among our earliest apelike ancestors, and that these differences provided the genetic variation which natural selection could act on when changes in the environment gave bipeds an advantage over quadrupeds.
Fossil and molecular evidence suggests the earliest ancestors of the human family lived in forested areas in equatorial Africa in the late Miocene era (中世纪) some 8 to 10 million years ago, when changes in climate may have increased the distance between food patches~ That would have forced our earliest ancestors to travel longer distances on the ground and favored those who could cover more ground using less energy.
"This isn't the complete answer," Sockol said. "But it's a good piece of a puzzle humans have always wondered about: How and why did we become human? And why do we alone walk on two legs?"
41. Michael Sockol and his team were interested in
A. where humans came from.
B. how chimpanzees could be trained to use treadmills.
C. when our earliest ancestors began to live in forested areas
D. why our apelike ancestors came to walk on two legs.
42. The phrase "worked out' in paragraph 3 could be replaced by
A. calculated. B. exercised.
C. understood. D. planned.
43. What did the researchers find in the experiment?
A. One chimp used about the same energy in walking on two legs as on all fours
B. Human walking used more energy than bipedal walking in chimps.
C. Two chimps used more energy walking on two legs.
D. Three chimps used less energy walking on two legs.
44. The word "quadrupeds" in paragraph 6 is a technical word for
A. creatures with four feet. B. creatures with two feet.
C. creatures with six feet. D. creatures with eight feet.
45. What does fossil and molecular evidence tell us about our earliest ancestors?
A. They experienced more climate changes than we do today.
B. They were forced to travel between food patches.
C. They could cover more ground with less energy.
D. They were much taller than modern man.
2008年职称英语真题之理工类A级补全短文:

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What，S Lacking in“Sicko”?
when．t comes to economic decisions，there are always trade. offs(取舍)•Gain 0ne thing and you lose something else．_________(46)
The central argument of Michael Moore’s movie“Sicko”一that the cure t0 the nation，s health care problems is a single—payer system—is hardly novel and Is certainly worth consideration，whether or not you agree with it．But in comparing the American system with single-payer plans of other countries—Britain，France，Canada and Cuba Mr．Moore left Out the trade-offs，characterizing those countries as health care paradises. ___________(47) Kurt Loder, the film critic who is best known as the anchor(主持人)of“MTV News，”wrole a critique(批评)of the film for MTV’s website．"Sicko，"he said, "does a real service”in portraying(描绘)victims of American insurance companies’-like the people，who died because their only treatment options were considered“experi