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
2023-07-26
14
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] We can learn from the passage that ______.
选项
A、repellents work in three ways
B、repellents work more than giving off a nasty smell
C、scientists discovered smell is the mosquito’s strongest sense
D、scientists have found some practical ways to avoid being bitten by the mosquito
答案
B
解析
细节题。第三段第二句肯定了选项B。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2869831.html
相关试题推荐
AuniversityStudentinNairobi,Kenya,wasstoppedforatrafficviolation
AuniversityStudentinNairobi,Kenya,wasstoppedforatrafficviolation
Degrees,ButNoJobsChina’suniversitygraduatesar
Degrees,ButNoJobsChina’suniversitygraduatesar
Degrees,ButNoJobsChina’suniversitygraduatesar
Degrees,ButNoJobsChina’suniversitygraduatesar
Degrees,ButNoJobsChina’suniversitygraduatesar
Degrees,ButNoJobsChina’suniversitygraduatesar
Therearemorethan200scientistsintheinstitute,______(其中只有三人)areworkingt
[originaltext]M:Hello!UniversityBooks.TimWeberspeaking.W:Hi!Tim,this
随机试题
Accordingtothepassage,theinventorsofwrittenlanguageinMesopotamiawere
Basedonananalysisofameteorite,______(科学家们认为火星存在生命).scientistsarguefor
Howdoyougetthemostoutofyourrevisiontime,andendupwiththebestg
妊娠囊平均径线是1cm,胎龄应是A.4~5周 B.5~6周 C.6~7周
如何根据青少年的身心发展规律进行教育
目前,我国的开放式基金的估值频率为()估值A.每个交易日 B.每两个交易日
(2015年真题)中国期货业协会应当自对期货从业人员做出纪律惩戒决定之日起(
甲国公民查尔斯读书期间曾在中国某大学交流半年,并认识了中国学生小严,现查尔斯申请
由牙周引起牙髓感染的最主要途径是通过A.根尖孔 B.副根尖孔 C.侧支根管
作为一种融资方式,优先股具有某些优先权利,包括( )。A.先于普通股行使表决权
最新回复
(
0
)