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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】________.
【L39】
选项
答案cheaper
解析 空格后由than连接，说明是在把生物方法(Biological Methods)和另一种化学方法(Chemical Methods)进行对比。录音原文中的描述为This is a cheaper alternative to…“这是一种比较便宜的方法”用了比较级cheaper，省略了than和比较的对象，故空格处可直接填写cheaper。
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