阅读下列短文，从所给的四个选项中，选出最佳答案．

　You may think there is only sand in the desert of the world, 　1　 it is not true．In the desert, as we know, there is a little 　2 　, but it is not 　3 　for most plants. Still we can see some plants 　4 　in the desert．

　There is 　5 　in some places in the desert．We 　6 　these places oases(绿洲)．In the oases, there are villages and towns．People grow 　7 　kinds of crops in the fields there．

　People 　8 　live outside the oases．They have camels, sheep and other animals．These animals depend 　9 　the desert plants for their food and do not need 　10 　water．

　The 　11 　are useful to the desert people in many ways．They eat the 　12 　and drink the milk of the animals．They 　13 　the camels for carrying water, food, tents(帐篷)and 　14 　．

　The people of the desert have to keep 　15 　from place to place．They must always look 　16 　grass or desert plants for their animals．When there 　17 　no more food for their animals, they move to 　18 　place．The desert people are 　19 　．No man in the desert would ever refuse 　20 　the people in trouble and give them food and water．

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　In the doctor's waiting-room, sick men and women sitting on their chairs. Bob, a school boy, was among them. They all looked sad 　1　 Bob. He was deep(深) in an 　2　　 　story in a magazine. Just then the doctor came in to say he was ready　　 　3　　 　the next person. Bob jumped 　4　　 　and ran into the doctor's room.

　“　 　　 5 　?” said the doctor. Before Bob could say a word , the doctor made him　　 　6　　 　a bed, “ Now, let me　　 　7　　 　your heart. ” Bob tried to speak, but the doctor told him not to　　 　8　　 　.“ I will　　 　9　 your temperature.” Bob tried to sit up, but the doctor stopped him. After a moment, the doctor said, “Well, boy, you don't have a fever. In fact, there's nothing wrong with you.”

　“ I know there isn't, ” said Bob, “ I just came here to get　　 　10　　 　medicine for my father.”

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　　Hi Alan,

　　Thanks (1) your invitation (2) next week. I'm sorry, (3) I can't come. I have a really (4) week. This evening I (5) a meeting. And tomorrow, I (6) to my aunt's birthday party. (7) Wednesday, I (8) with my parents. And I have to study (9) my math test on Thursday. On Friday evening, I (10) go to the dentist. Can we have a drink together on Saturday?

　　Write soon.

David

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　　完形填空.

　　Hi Alan,

　　Thanks (1) your invitation (2) next week. I'm sorry, (3) I can't come. I have a really (4) week. This evening I (5) a meeting. And tomorrow, I (6) to my aunt's birthday party. (7) Wednesday, I (8) with my parents. And I have to study (9) my math test on Thursday. On Friday evening, I (10) go to the dentist. Can we have a drink together on Saturday?

　　Write soon.

David

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