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, orthe sensors are made to send the 20 signals. A. examined B. animal C. wrong D. insect E. bite F. Unfortunately G. inventing H. distinctI. prey J. guide K. checked L. definite M. Unnecessarily N. confuse O. discovering11. O 12. F 13. H 14. E 15. I 16. A 17. N 18. J 19. D 20. C
09中考英语话题作文预测范文17大地震
09中考英语话题作文预测范文6
09中考英语话题作文预测范文4
09中考英语话题作文预测范文8兴趣与爱好
09中考英语话题作文预测范文35饮食
09中考英语话题作文预测范文 2
09中考英语话题作文预测范文33购物
09中考英语话题作文预测范文25日常活动
09中考英语话题作文预测范文13进步
09中考英语话题作文预测范文31文娱与体育
09中考作文指导训练1:17种基本句子
09中考英语话题作文预测范文27人际关系
09中考英语话题作文预测范文30历史与地理
中考英语作文范文:5.Small kinds
09中考英语话题作文预测范文24以我的学校为骄傲
中考英语作文范文:6.My opinion on Internet
09最新中考英语作文范文7篇
09中考英语话题作文预测范文14毕业典礼上发言
09中考英语话题作文预测范文22八荣八耻
09中考英语话题作文预测范文9朋友
09中考英语话题作文预测范文20征文活动
09中考英语话题作文预测范文11对老师表达感谢和祝福
中考英语作文范文:2.My view on television
09中考英语作文指导训练3:命题作文
09中考英语话题作文预测范文16个人情感
中考英语作文十大常见错误分析
09中考英语话题作文预测范文23参观科学博物馆
09中考英语话题作文预测范文22座谈交流
09中考英语话题作文预测范文19学校生活
09中考英语话题作文预测范文32健康
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