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41. Mosquitoes        breed in swampy areas.

 A. always               B. rarely                  C. never                  D. Generally

D


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Some spiders hunt on the ground, others build webs to trap their food, but the grass water spider catches its prey by running along the surface of the water.

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Although it is one of the largest spiders in New Zealand, it has an unusual ability. It doesn’t disturb the water as it waits for its meal, and there is barely a ripple(波紋) when it skims(掠過) across the surface at lightning speed to catch its prey.

Grass water spiders deal swiftly with larger insects like damsel flies by pulling their heads under the water and holding them there until they drown.

After a meal, the grass water spider spends up to half an hour grooming(修飾) itself. It wipes its eight eyes, brushes its antennae(觸角), and takes special care to clean the hairs on its body.

It is the hairs that trap tiny bubbles(泡沫) of air so that the spider can run down a blade(葉片) of grass and stay underwater for up to an hour when it is frightened. The hairs also keep the spider dry, even underwater.

It is only when the female spider is caring for the young that she does not hunt on the water. After mating, she produces a large egg sac(囊), which she carries around for five weeks. Once the eggs start to hatch, she attaches the sac to some blades of grass or a thistle. She then tears the sac open and releases the tiny spiders into the nursery web.

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B. lives on blades of grass under the water

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科目:高中英語 來源:浙江省余姚中學2009-2010學年度高一下學期第一次質量檢測 題型:閱讀理解


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B. How many people are killed by malaria each year?
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A.The Importance of Geographical Environment
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科目:高中英語 來源:2012-2013學年黑龍江哈爾濱市高三第五次月考英語試卷(解析版) 題型:信息匹配

根據短文內容,從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。

It’s summertime-time once again for mosquitoes to make their appearance. And once they appear, mosquitoes are a total pain. They land on you,  bite you, suck out some blood and leave behind an itchy welt(發癢的紅腫).

  1  Female mosquitoes must find blood in order to reproduce, so mosquitoes come equipped with finely tuned sensors to help them locate the blood they need.

Mosquitoes’ weapons

Mosquitoes have perfected three different types of sensors. First, mosquitoes can sense several different chemicals. Mosquitoes can smell carbon dioxide and lactic acid(乳酸)up to 100 feet away.   2 

Second, mosquitoes have very good eyesight. If you are wearing clothing that contrasts with the background, and if you move while wearing that clothing, mosquitoes can see you. It’s a good bet that anything moving is alive, and therefore full of blood.

Finally, mosquitoes come equipped with temperature sensors, so they can find warm-blood mammals and birds very easily.

  3  The female mosquito sticks her proboscis(喙)into you. She sucks about five microliters of your blood into her abdomen.

After she has bitten you, some saliva(唾液)remains in the wound.   4  The area swells and you tich. Eventually, the selling goes away, but the itch remains until your immune cells break down the saliva proteins.

Our defense methods

Because mosquitoes are both a nuisance(討厭的東西) and a danger, people prefer to stay away from mosquitoes. One way to do that is to use a chemical called DEET, which seems to black a mosquito’s chemical sensors.   5  In some cities there are even trucks that drive around town to spray for mosquitoes. Finally there are to traps. The most popular traps turn propane(丙烷) into carbon dioxide and warmth to attract mosquitoes. Over time, by catching large numbers of mosquitoes, these traps can cause the collapse of the mosquito population in the area.

A.Another way to control mosquitoes is with insecticides(殺蟲劑) that kill them.

B.How mosquitoes work is unknown to most of us.

C.Once a mosquito lands on you, it is time to bite.

D.Some bites of mosquitoes are more serious than you thought.

E. Mammals and birds give off these gases as part of their normal breathing.

F. The proteins from the saliva create an immune response from your body.

G. But if you ignore the fact that mosquitoes are so annoying they really are amazing.

 

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