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  3. How to Kill Bad Insects Chemical Methods These solutions to insect problems are often not worthwhile because: a) They are effect

How to Kill Bad Insects Chemical Methods These solutions to insect problems are often not worthwhile because: a) They are effect

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问题                  How to Kill Bad Insects
Chemical Methods
These solutions to insect problems are often not worthwhile because:
a) They are effective on a【L36】________.
b) They can bring harm to【L37】________.
c) Insects become【L38】________to the chemicals quickly.
Biological Methods
These Methods are【L39】________than chemical methods of eliminating harmful insects.
Breeding Control Methods
In order to control the breeding of insects, one needs to understand the insects’【L40】________.
【L38】
选项
答案resistant
解析 本题询问这些防治害虫的方法并不十分有效的原因。录音原文中指出，昆虫在几代内都会对这些毒药产生抗药性(become resistant to most poison)，poison与题目中的chemical为同义替换，故空格处填入resistant“耐药的，抗药的”。
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