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
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2017届高考英语一轮全册复习课时作业：必修2.4《Wildlife protection》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块5.3《science and nature》（解析版）
2017届高考英语一轮全册复习课时作业：必修3.4《Astronomy：the science of the stars》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修2.3《Computers》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修1.3《Travel journal》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修2.2《The Olympic Games》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块8.1《the written word》（原卷版）
2017届高考英语一轮全册复习课时作业：必修1.4《Earthquakes》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修5.1《Great scientists》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块5.3《science and nature》（原卷版）
2017届高考英语一轮全册复习课时作业：选修6.4《Global warming》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：选修7.1《Living well》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块7.1《living with technology》（解析版）
2017届高考英语一轮全册复习课时作业：必修2.5《Music》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修3.3《The Million Pound Bank Note》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：选修6.3《A healthy life》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修4.5《Theme parks》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块7.3《the world online》（原卷版）
2017届高考英语一轮模块复习学案：模块6.1《laughter is good for you 》（原卷版）
2017届高考英语一轮模块复习学案：模块8.2《the universal language》（原卷版）
2017届高考英语一轮全册复习课时作业：必修5.4《Making the news》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块8.1《the written word》（解析版）
2017届高考英语一轮全册复习课时作业：必修5.5《First aid》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修5.3《Life in the future》（新人教版含解析）
2017届高考英语一轮全册复习课时作业：必修3.2《Healthy eating》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块6.2《what is happiness to you》（解析版）
2017届高考英语一轮模块复习学案：模块8.4《films and film events 》（原卷版）
2017届高考英语一轮全册复习课时作业：必修1.5《Nelson Mandela—a modern hero》（新人教版含解析）
2017届高考英语一轮模块复习学案：模块8.3《the world of colours and light 》（解析版）
2017届高考英语一轮模块复习学案：模块6.2《what is happiness to you》（原卷版）