【正确答案】 A

【答案解析】[听力原文]32-35
(32)Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them. Guess how many years have the insects been eating plants. The number itself will scare you. (33) In fact, insects have been eating plants for as many as 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done? Scientists studying the problem suggest (34) that farmers use less insecticides. At the moment, farmers (34)regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, (34)farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract new insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.
(35) Scientists hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
32. What conclusion can be drawn from the scientists observation?

[听前猜测]四个选项内容多与昆虫有关，由此可以推断，本问题考查的内容很有可能是关于昆虫的某个陈述。
[精解]昆虫通过进化可以抵制植物本身的抗虫物质一一有毒化学物质poisonous chemicals，昆虫也可以通过相同的方式对付人工杀虫剂man-made poisons—insecticides。这就是昆虫的抗杀虫剂性迅速增强的原因。可见科学家发现了昆虫的抗杀虫剂性。故正确答案为A)。

【正确答案】 D

【答案解析】[听力原文]
Why did the resistance of insects to man-made insecticides develop so rapidly?

[听前猜测]四个选项都是Because开头的句子，由此可以推测，本问题考查的内容为某件事情的原因。
[精解]昆虫吃植物的历史已经长达两亿五千万年“In fact, insects have been eating plants for as many as 250 million years”，所以它们的抗杀虫剂性能增长得非常迅速。因为它们已经习惯不断进化，对抗各种植物杀虫剂、人工杀虫剂：Now insects are using these same mechanisms to deal with man-made poisons—insecticides...insecticides has developed so rapidly. 故正确答案为D)。

【正确答案】 C

【答案解析】[听力原文]
Which of the following is NOT included in the scientists’ suggestions?

[听前猜测]四个选项都是关于农民应该采取的措施，由此可以推断，本问题考查的内容可能是关于农民应该采取的行为。
[精解]本题选项中A)、B)、D)均可在文中第二段找到相应话语。故正确答案为C)。

【正确答案】 D

【答案解析】[听力原文]
What can be inferred from the passage?

[听前猜测]四个选项都是关于昆虫的叙述，由此可以推断，本问题考查的内容可能是关于昆虫的行为或者状态。
[精解]科学家希望义中提到的措施可以延缓庄稼面临新型的肆虐虫灾的侵害：Scientist hope that these and other measures will postpone...our farms and devour our crops. 可见昆虫对生态的杀虫剂和人工杀虫剂的抵抗力都是增长得十分迅猛的。故正确答案为D)。