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
体坛英语资讯:Chilean midfielder Fernandez is not severely injured, doctor
全球最大核聚变工程有望创造终极清洁能源
国内英语资讯:China at forefront of sci-tech human resources with rising proportion of women
体坛英语资讯:Nighty-year-old Chinese pockets three golds at U.S. National Senior Games
体坛英语资讯:Mexico Beats US in CONCACAF Final
俄罗斯注册世界首款新冠疫苗 普京女儿已接种
体坛英语资讯:Germany beats Nigera 1-0 at FIFA Women World Cup
体坛英语资讯:Lets share the joy of Special Olympics
体坛英语资讯:Brazil stuns Norway 3-0 at FIFA Women Worlds
国内英语资讯:China to select, honor model military veterans
体坛英语资讯:Neymars agent reveals deal with Real Madrid
体坛英语资讯:Five-time champion Venus Williams ousted from Wimbledon
体坛英语资讯:Powell runs world fastest 100m of year at Lausanne
体坛英语资讯:Czech Republics Petra Kvitova Wins Wimbledon Womens Title
体坛英语资讯:Barca extend Pedro contract
体坛英语资讯:Vietnam to attend 2011 Military World Games in Brazil
体坛英语资讯:Wolfsburg signs midfielder Hasan Salihamidzic for one year
体坛英语资讯:Chinese tennis player Li Na to attend Rogers Cup in Toronto
国内英语资讯:China eyes more opportunities for foreign companies: spokesperson
国内英语资讯:Feature: Two faces of U.S. in eyes of former UN resident correspondent
体坛英语资讯:Dutch hockey women capture sixth Champions Trophy
体坛英语资讯:NBA Imposes Player Lockout
“别误会”用英语怎么说?难道是dont mistake?
体坛英语资讯:France beat Canada 4-0 at FIFA Women World Cup
体坛英语资讯:Norway beats Equatorial Guinea 1-0 at FIFA Women World Cup
谷歌研发新地震警报系统 手机秒变地震仪
体坛英语资讯:Internacional blasts Figueirense 4-1
国际英语资讯:DPRKs top leader appoints new premier
体坛英语资讯:Vinci and Errani safely through to second round of Budapest Womens Grand Prix tennis
体坛英语资讯:Special Olympics opens in Athens with spectacular ceremony
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |