参考答案：
31. C People who drink alcohol outside of meals.
32. D It increases by 20 percent the risk of cancer in all the four sites.
33. B 20
34. B Laryngeal cancer
35. A reduces the risk of laryngeal cancer.
参考答案
36. C It was hard to make.
37. C His father was in pain.
38. D It works well in stopping pain.
39. B the first aspirin sold in US
40. C Its new use has been discovered.
参考答案
41. A. To observe how honey badgers behave.
42. A. They show interest in things they are not familiar with.
43. B. They may get some of the water they needed from fruit.
44. C. They hunt over a very large area.
45. A. They lost interest in people.
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