首页
登录
职称英语
Scientists at Sussex university appear to be on the way to discovering how t
Scientists at Sussex university appear to be on the way to discovering how t
游客
2024-02-27
22
管理
问题
Scientists at Sussex university appear to be on the way to discovering how the mosquito, earner of diseases such as malaria and yellow lever, 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. Unfortunately the first suggestion is impossible and the others very difficult.
Scientists have found that there are three distinct stages in a mosquito’s assault. Stage one is at fifty feet away, when the insect first smells a man or animal to bite. 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 prey: the warmth and moisture given off by the victim is the final clue. The researchers then examined how repellents (驱虫剂) 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 confuse mosquitoes first when it is following the carbon dioxide and second during the find approach, where the warmth and moisture aren’t the insect’s guide.
Air pervaded by one of the many chemical repellents stops the mosquito reacting to the victim’s carbon dioxide, anti the repellent seems to affect the tiny hairs with which the insect senses moisture in the air. The sensors are blocked so that the insect does not know when it is flying through a moist current, or the sensors are made to send the wrong signals.
One positive suggestion from the researchers followed the discovery that mosquitoes on the hunt tend to fly very close to the ground. A dense screen of trees around a village may keep mosquitoes at bay.
The experts also agree that mosquitoes seem to prefer some people to others, but they don’t know why. [br] The phrase "homes in on its target" (Sentence 1, Para. 1) in the context means ______.
选项
A、find its way to the intended victim
B、move towards the prey
C、set off for the target
D、aim at the victim
答案
A
解析
语义理解题。根据上下文的语境,句中how the mosquito homes in on it’s target意思是“蚊子是如何找到它要攻击的目标的”。
转载请注明原文地址:https://tihaiku.com/zcyy/3486092.html
相关试题推荐
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
GallaudetUniversitycurrentlydoesnotallowstudentstokeeppetsinthei
随机试题
Whitman,whohadworkedasanewspaperman,laterbecamenotedforhisuseof____
EnginesofChangeTheHolyGrail(圣杯)forA
综合布线系统的设备间,其位置的设置宜符合哪项要求?()A.靠近低压配电室
单位产品成本报告期比基期下降10%,产量增长10%,则总的生产总费用()A.增加
D只有D所示的图形是由左边的纸板折叠而成,所以正确签案是D。
薯蓣皂苷元结构属于A.羽扇豆醇型 B.α-香树脂醇型 C.β-香树脂醇型
A.5 B. C.1/3 D.1/5
下列说法中,正确的是( )。A.大赦既赦其刑,又赦其罪B.特赦只赦其刑
细胞膜∶细胞A.皮肤∶肌体 B.盔甲∶身体 C.植被∶土地 D.土壤∶地球
求助者一般资料:女性,32岁,未婚,某公司前台。 求助者自述:自己一直单身,
最新回复
(
0
)