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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】________.
【L40】
选项
答案life cycle
解析 本题询问要控制害虫的繁殖，人们需要对昆虫的哪些信息进行了解。录音原文中指出人们必须要了解昆虫的生命周期(life circle)。must have an understanding与题目的needs to understand为同义表述，故空格处可直接填写life cycle。
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