If pumps stop working there will be very bad floods because__________．

A．the water will run back at high tide

B．the sea may break the dykes in rough weather

C．the battle against water will never end

D．the land is too low and water can rise up through the drained land

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参考答案

答案解析

细节判断题。第五段开头提到：Because the land is so low，water from the sea and rivers can rise up through the ground，选项D正是这句话的改写。

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1 The word "polder" means__________．

A．a piece of newly-claimed land

B．a small island

C．a newly built dyke

D．a long canal

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2 根据下面资料，回答题
No matter who you are or where you come from, one thing is certain, you are acquainted with the mosquito (蚊子)--although you probably wish you weren´t． Mosquitoes are every-where． They can be found all over the world,and they come in more than 2,500 species．
Somewhere,at some time,you have surely met at least one．
No one loves the mosquito． But unfortunately the mosquito may decide that she loves you． Yes, She． Only the female mosquito bites． It´s not because she´s unfriendly．, she needs blood to reproduce． The female mosquito is quite selective, and she chooses her victims care-fully． First, she uses sensors to find her victim． With these sensors, she tests your body moisture ,body warmth,and chemical substances in your sweat． If she likes what she finds,she bites． But if you don´t appeal to her,she´ll reject you for someone more appetizing． The next time a mosquito bites you,just remember that you were chosen． You´re special．
If the mosquito likes you, she settles onto your flesh very gently, and she breaks your skin with her proboscis tip． It´s a kind of mouth and it sticks out just below the mosquito´s eyes． She stabs the proboscis tip into your skin at once,and if she hits a blood vessel,she´ll get a full dinner in about a minute． After that,the mosquito is tired． Heavy with your blood,she picks a spot--on a leave or a stone--to lay her eggs． Just one drop of blood will produce hundreds of eggs．
By the sentence "you are acquainted with the mosquito--although you probably wish you weren´ t", the author means that people__________．

A．don't like the mosquito but it is always there

B．know mosquitoes and wish them well

C．wish all the mosquitoes disappeared

D．want to be friendly to mosquitoes but fail at last

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3 Why is it only the female mosquito that bites?

A．She is more unfriendly than male．

B．She is greater in number．

C．Blood is her favorite food．

D．Blood enables her to lay eggs．

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