According to the first paragraph, pictures of animals were painted on the walls of caves because ______.
A. the pictures were thought to be helpful
B. the painters wanted to tell stories in pictures
C. the painters wanted to paint their hunted animals
D. both A and B
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400名肥胖患者用气功疗法减肥，随访半年，60%的人体重降至正常。对此项研究，你的结论是
A. 气功疗法减肥效果好，观察半年 60%的病人有效
B. 此法效果可疑，40%未见效
C. 无法做出结论，因样本较小
D. 无法做出结论，因未设对照组
E. 无法做出结论，因未进行统计学检验
具有传染性，发丘疹损害的皮肤病称为
A. 疥
B. 湿毒
C. 丘疹
D. 癣
E. 湿疹
Dr. Leakey studied chimpanzees in Africa because（）
A. he thought that they were the best friends of humans'
B. he believed that prehistoric people might live a life similar to the life chimps lived now
C. he loved the animals
D. the chimpanzees were very shy
We can infer from the passage that（）
A. Dr. Leakey studied chimps because he began to love the animals
B. after she met Dr. Leakey, Jane began to study the way that early people lived while observing chimpanzees
C. the country was very difficult to travel through
D. Jane worked with Dr. Leakey because she loved him
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