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  3. According to the World Health Organization, malaria, a disease spread by mos

According to the World Health Organization, malaria, a disease spread by mos

游客2023-10-18  73
问题     According to the World Health Organization, malaria, a disease spread by mosquitoes, affects millions of people every year. Everyone knows【76】h______irritating the noise made by a mosquito , accompanied by a painful reaction to its bite, can be. It is【77】ast______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 insects. We know that the most effective【78】ch______for protecting people against mosquitoes is diethyltoluamide, commonly shortened to DEET.【79】Al______DEET works well, it has some serious drawbacks; it can【80】dam______clothes and some people are allergic to it.

    Scientists know that mosquitoes find some people more attractive than others, but they do not know why this should be. They also know that people【81】va______in their reactions to mosquito bites. One person has a painful swelling while【82】an______who is bitten by the same mosquito, may hardly notice. Scientists have not discovered the reason for this, but they have【83】ca______out experiments to show that mosquitoes are attracted to, or put off by, certain smells. In the future, scientists hope to develop a smell【84】t______mosquitoes cannot resist. This could be used in a trap so that, instead of attacking people, mosquitoes would fly into the trap and be destroyed. For the time【85】be______, however, we have to continue spraying ourselves with unpleasant liquids if we want to avoid getting bitten. [br]
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答案 chemical
解析 (chemical化学药品。)
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