Scientists at Sussex University appear to be on the way to 11 how the mosquito, carrier of diseases such as malaria and yellow fever, homes in on its target. The problem is that they have found that the best way to avoid being bitten is: stop breathing, stop sweating, and keep down the temperature of your immediate surroundings. 12 the first suggestion is impossible and the others very difficult.
Scientists have found that there are three 13 stages in a mosquitos assault. Stage one is at fifty feet away, when the insect first smells a man or a animal to 14 . Stage two is thought to come into operation about twenty-five feet from the target, when the insect becomes guided by the carbon dioxide breathed out by the intended victim. Stage three is when the mosquito is only a matter of inches from its 15 the warmth and moisture given off by the victim is the final clue.
The researchers then 16 how repellents interfere with its three-stage attack. They found repellents act more subtly than by just giving off a nasty smell. A Canadian researcher says that repellents appear to 17 mosquitoes first when it is following the carbon dioxide and second during the final approach, where the warmth and moisture are the insects 18 .
Air pervaded by one of the many chemical repellents stops the mosquito reacting to the victims carbon dioxide, and the repellent seems to affect the tiny hairs with which the insect senses moisture in the air. The sensors are blocked so that the 19 does not know whether it is flying through a moist current, or the sensors are made to send the 20 signals.
A. examined B. animal C. wrong D. insect
E. bite F. Unfortunately G. inventing H. distinct
I. prey J. guide K. checked L. definite
M. Unnecessarily N. confuse O. discovering
11. O 12. F 13. H 14. E 15. I 16. A 17. N 18. J 19. D 20. C
Say No to Strangers 对陌生人说不
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尼日利亚总统在华盛顿与川普总统谈反恐和经济
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Present 礼物
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五月份最值得一看的5部电影
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That'll teach you! 这回你该长记性了!
哪10件事最值得你花时间去做?
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Who needs a manbag? 哪类男士会选择“manbag”?
那些暴露你年龄的科技产品,你都知道吗?
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喀布尔自杀袭击打死26人 包括9名媒体人
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