Complete the notes below.Write NO MORE THAN TWO WORDS for each answer.How to kill bad insectsChemical methodsThese solutions to insect problems often are not worthwhile because:a)They are effective on a 1b)They can bring harm to 2c)Insects become 3to the chemicals quickly.Biological methodsThese methods are 4than chemical methods of eliminating insects.Breeding controlIn order to control the breeding of insects, one needs to understand the insects' 5
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【正确答案】 1、small scale,    2、humans,    3、resistant,    4、cheaper,    5、life cycle    
【答案解析】解析：life cycle本题先不要着急写，一定要昕完。control the breeding of insects等信息在原文中虽然出现得比较早，但是要注意听紧贴空格处的内容understand the insects’，然后再回到原文中寻找：It’s clear that we must have an understanding of the life cycle of the insect．所以lifecycle才是答案。