Question

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.

 

Answer 1

【答案】

 G

 E

 C

 F

 A

【解析】

試題分析：本文介紹了我們在夏天常見的蚊子，從以下幾個方面做了介紹，一是它們為什么能夠發現可以吸血的人或動物。二是它們是用什么武器進行吸血的。三是我們防治蚊子的方法。

 根據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.故選G。

 根據Mosquitoes can smell carbon dioxide and lactic acid（乳酸）up to 100 feet away.這里說的是氣體，故選 E。

 根據The female mosquito sticks her proboscis（喙）into you蚊子先要落在人的身上，故選C。

 根據After she has bitten you, some saliva（唾液）remains in the wound.上下文意思的銜接，故選F。

 根據上下文的都是在殺蟲劑，然后又說另一種，故選A。

考點：科普類短文閱讀。

點評：做這種題時，考生應在通讀全篇短文的基礎上，把握各部分之間的邏輯關系，前后照應，注意文中的“鏈條”，充分理解短文的內容，使補全后的短文思想通順，前后連貫，且符合英美人的語言表達方式。