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题目
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All efforts of cloning an animal will be ________ if there is not enough diversity in the group to overcome illness.
A.in need B.in place C.in vain D.in case

答案
C
解析
词义辨析。A需要;B在合适的地方;C徒劳;D以防万一;结合句意可知C正确。句意:如果没有足够的多样性来克服疾病,所有克隆动物的努力都是徒劳的。
核心考点
试题【All efforts of cloning an animal will be ________ if there is not enough diversi】;主要考察你对介词和介词短语等知识点的理解。[详细]
举一反三
At the railway station,the mother waved goodbye to her daughter until the train was________.
A.out of sightB.out of reachC.out of order  D.out of place

题型:不详难度:| 查看答案
She owes her success________good luck more than ________ability.
A.to;andB.of;toC.to;toD.to;in

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Learning English means _________ memorizing a huge lot of words.It involves a large amount of reading as well.
A.other thanB.more thanC.rather thanD.less than

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_____professional development, big cities appeal to many young people .
A.In favour ofB.In terms of
C.In need ofD.In honour of

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— The traffic is too heavy. Would you like me to help you     the street?
— That’s very kind of you.
A.besideB.acrossC.oppositeD.over

题型:不详难度:| 查看答案
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