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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】________.
【L37】
选项
答案humans
解析 本题询问这些防治害虫的方法会给什么造成危害。录音原文中指出化学药品对人类有害(remain harmful to humans)，其中，remain harmful是题目bring harm to的同义替换，故空格处填入humans。
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