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  3. According to the World Health Organisation, malaria, a disease spread by mosquitoes, affects millions of people every year. Ever

According to the World Health Organisation, malaria, a disease spread by mosquitoes, affects millions of people every year. Ever

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问题 According to the World Health Organisation, malaria, a disease spread by mosquitoes, affects millions of people every year. Every one knows how irritating the【S1】______made by a mosquito, followed by a painful reaction to its bite, can be. It is【S2】______that so little is known about why mosquitoes are drawn to or driven away from people, given the level of distress and disease caused by these【S3】______. We know that the most effective chemical for protecting people against mosquitoes is diethyltoluamide(避蚊胺 , commonly【S4】______to deer. Although deet works well, it has some serious【S5】______: it can damage clothes and some people are allergic(过敏的 to it.
    Scientists know that mosquitoes find some people more attractive than others, but they do not know why this should be. They al so know that people vary in their reactions to mosquito bites. One person has a painful swelling while another, who is bitten by the same mosquito, may【S6】______notice. Scientists have not discovered the reason for this, but they have carried out experiments to show that mosquitoes are attracted to, or put off by,【S7】______smells. In the future, scientists hope to develop a smell that mosquitoes cannot【S8】______. This could be used in a trap so that, instead of attacking people, mosquitoes would fly into the trap and be【S9】______. For the time being, however, we have to continue spraying ourselves with【S10】______liquids if we want to avoid getting bitten.

A hardly               B nice                C certain            D insects
E advantages           F shortened           G drawbacks          H destroyed     
I unpleasant           J astonishing         K detect             L immediately
M noise                N exciting            O resist
【S4】
选项
答案F
解析
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