40. C。文章第一节中:We owe a lot to the birds and beast who eat insects, but all of them put together kill only a very small amount of the number destroyed by spiders.
41. C。文章第三节。
42. D。从they are hungry creatures, not content with only three meals a day可知答案。
43. A。综合全文可知。
【对话填空】
44. behave 45. that 46. both 47. way 48. try
49. right 50. offers 51. ourselves 52. Actually 53. basis
【书面表达】
I'm writing to tell about the discussion we've had in the recent class meeting about whether Senior 3 students should take a lot of tonics to keep fit.
Opinions are divided on the topic. Sixty percent of the students think it unnecessary to take any tonics. They hold the opinion that taking tonics will cause them to put on weight, which is bad for their health. What's more, the price of tonics is rather high.
However, forty percent of the students point out that Senior 3 students have a lot more homework to do every day. So many students get tired and tonics can help to refresh themselves. In addition, they can't afford time to have sports.
Personally, having right food is more important. The best way to stay healthy is to take exercise regularly.
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