From space, the earth looks blue. This is ________ about seventy－one percent of its surface is covered by water.

A．why B．how

C．because D．whether

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完形填空

閱讀下面短文，從短文后各題所給的四個(gè)選項(xiàng)(A、B、C和D)中，選出可以填入空白處的最佳選項(xiàng)。

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I was so sorry for myself that I wrote to my parents. I told them I was _________ and coming back home. I said I couldn’t stand it one minute longer. I _________ be in prison! My father answered my_________ with just two lines—two lines that will always sing in my _________ — two lines that completely changed my life:

Two men looked out from prison bars,

One saw the mud, the other saw the stars.

I read those two lines _________ . I was ashamed of myself. I made up my mind I would find out what was good in my present _________ I would look for the stars.

I made friends with the natives, and their _________ amazed me. They gave me presents of their favorite artworks which they had _________ to sell to tourists. I studied the delightful forms of the cactus. I watched for the desert sunsets, and _________ for seashells that had been left there millions of years ago when the desert had been an ocean _________ .

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1.A. offB. behindC. nearD. beyond

2.A. beforeB. alreadyC. thenD. still

3.A. inflexibleB. incomprehensible

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5.A. coveredB. filledC. buriedD. charged

6.A. catching upB. keeping up

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7.A. ought toB. might wellC. would ratherD. had better

8.A. requestB. callC. questionD. letter

9.A. comparisonB. imaginationC. considerationD. memory

10.A. over and overB. by and by

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17.A. asB. butC. forD. or

18.A. attitudeB. principleC. identityD. standard

19.A. vacationB. operationC. affairD. adventure

20.A. soughtB. countedC. foundD. reached

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