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1、知道水循环的概念

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20.We tried to ______ his doubts and let him tell the truth.

A.replace      B.review         C.remove         D.rebuild

解析:此题考查动词辨析。replace“放回原处;取代”;review“再检查;回顾;复习”;remove“去掉;脱掉;除名”;rebuild“重建”。根据句意此处应用remove表示“消除疑虑”的意思。

答案:C

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19.-The cars give off a great deal of waste gas into streets.

-Yes.But I’m sure something will be done to ______ it.

A.reduce     B.remove         C.collect        D.warn

解析:此处为采取措施“减少”废气排放。

答案:A

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18.-Why was he fined?

-He happened to ______ flowers in the park.

A.be seen step on  B.be seen picking C.be caught to pull  D.catch damaging

解析:本题考查动词辨析以及非谓语动词的语态。根据句子的意思分析,此处应该使用被动。A项的step on作be seen的宾补时,不能用原形;C项的结构应该为be caught doing sth.。

答案:B

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17.The bird flu ______through Asia has jumped from birds to humans at least 20 times so far,______16.

A.sweeps;killed             B.swept;killing  

C.sweeping;to kill            D.sweeping;killing

解析:本题考查非谓语动词作定语和伴随状语的用法。第一个空用现在分词作定语,相当于谓语动词为主动的定语从句结构;第二个空为非谓语动词作伴随状语,表示和has jumped同时发生的动作。

答案:D

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16.Though bought ten years ago,the car is still in good ______.

A.situation    dition     C.position      D.station

解析: in good condition在此处表示“状况很好”的意思。

答案:B

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15.-Is it for two months ______ they have stayed here?

-No,it is only three weeks ______they arrived here.

A.that;since     B.that;when     C.when;that     D.since;before

解析:从第一句话的句子结构和句子的意思分析,此句应是强调句型,被强调的内容为:for two months,所以用that引导。第二句的结构为:It is+ 一段时间+since,意思为“……已经多久了”。

答案:A

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14.-I really appreciate______ time to relax.

-I don’t doubt ______ able to do so.

A.to have;you to be             B.having;that you being

C.to have;you are               D.having;that you are

解析: appreciate后跟v.-ing形式作宾语。

答案:D

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13.You must try some of her home-made wine.It’s quite an unforgettable ______.

A.experiment     B.experience       C.effort         D.skill

解析:本句话的意思为“尝一下她自家酿造的葡萄酒是一次难忘的经历”。

答案:B

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12.A cook will be immediately fired if he is found ______in the kitchen.

A.smoke       B.smoking      C.to smoke      D.smoked

解析:本题考查非谓语动词的用法。根据句意和“find”动词的用法要求,此题的正确答案应为B。

答案:B

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