Complete the notes below.Write NO MORE THAN TWO WORDS for each answer.How to k

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问题 Complete the notes below.
Write NO MORE THAN TWO WORDS for each answer.
How to kill bad insects
Chemical methods
These solutions to insect problems often are 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 insects.
Breeding control
In order to control the breeding of insects, one needs to understand the insects’ 【L40】______ [br] 【L36】

选项

答案 small scale

解析 small scale本题遵循冠词不换原则,找a后面的单数名词。原文提到:Unfortunately,chemicals can only be used in a limited area for a limited time.It’s a small scale solution.所以在听到chemical时,就要准备找答案了。
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