参考答案
　　1. D. spread
　　2. C. end
　　3. A. about
　　4. B. offensive
　　5. D. attracted
　　6. D. influence
　　7. B. travel
　　8. B. inflexible
　　9. B. strange
　　10. D. break
　　11. A. cautious
　　12. D. found by chance
　　13. C. fixed
　　14. B. understand
　　15. D. unbelievable

参考答案
　　23-30 BFDA  CEAD

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.

参考答案
　　1、D. The majority of the world’s sugar now comes from this particular commercial species.
　　2、B. Unfortunately, however, the plant started to become weaker and more prone to disease.
　　3、A. Eventually, a commercial plant was developed which was 5 percent sweeter than before, but also much stronger and less likely to die from disease.
　　4、F. Since the 1960s, scientists have been analyzing the mysteries of the sugar cane’s genetic code.
　　5、C. One major gene has been identified by Dr Angelique D’Hont and her team in Montpelier, France.