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
考研优美英语作文的背诵042
2014考研英语攻略之六大作文
考研优美英语作文的背诵032
2014考研英语写高分英语小作文
考研优美英语作文的背诵046
考研优美英语作文的背诵035
考研优美英语作文的背诵043
洞悉考研英语作文潜规则投其所好1
考研优美英语作文的背诵030
2014考研英语新大纲发布小作文备考注意事项
考研优美英语作文的背诵031
考研优美英语作文的背诵036
优美英语作文背诵005
考研优美英语作文的背诵040
经验谈英语作文动笔之前先读听说
考研优美英语作文的背诵058
2014考研英语备考写作要求及评分细则
2014考研英语应用文的写作方法全面指导
洞悉考研英语作文潜规则投其所好2
考研优美英语作文的背诵015
考研英语短文写作题型分类与历年真题详析
考研优美英语作文的背诵052
考研优美英语作文的背诵056
考研优美英语作文的背诵047
考研优美英语作文的背诵045
考研英语作文这样拿高分作文备考有技巧
考研优美英语作文的背诵057
考研优美英语作文的背诵041
2014年考研英语常见话题的经典句型写作2
2014考研英语作文复习要趁早多积累
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |