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【单选题】
人有一种记忆叫免疫记忆人的血液中有着极少的富有自我牺牲精神的细胞，它们生存的时间极短，主要职能是尽量多地消灭人体的敌人。淋巴细胞对侵入血液中的细菌或者简单有毒物质做出快速反应，生成抗体，把有害物质粘住，不让它们进入其他器官。而消灭来敌的重任则落在血液中的吞噬细胞头上，这些细胞能够毫不费力地区别外来细胞，能够把它们记住并把记忆保留下来。人一旦得过麻疹或猩红热，就会获得终身免疫力。这段文字理解不正确的是( )。A.
人的血液中的吞噬细胞的主要职能是记住侵入人体的外来细胞
B.
淋巴细胞能够把侵入血液中的有毒物质粘住，并阻止它们进入其他器官
C.
人的血液中吞噬细胞和淋巴细胞都是富有自我牺牲精神的细胞
D.
人具有免疫记忆，若得过麻疹和猩红热后，就会获得终身免疫力
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【单选题】After ______ on his couch more than a dozen times, he gave up his attempt to sleep.
A.
he overturned
B.
his having turned over
C.
turning over
D.
turning up
【简答题】A．He put it back on the ground. B．He put it into his own pocket. C．He threw it into a trashcan. D．He gave it to the police.
【简答题】To prepare for the interview, he had put on his best suit and polished his shoes，and now, as he entered the office，he wore a ______ smile on his face． 为了面试，他穿上了最好的衣服，擦亮了皮鞋，现在他走进办公室时，脸上带着动人的微笑。
【单选题】He ______ his textbooks when he left school and never reopened them.
A.
put back
B.
put aside
C.
put down
D.
put off
【简答题】We wish he ______ his overcoat. A) does put on B) had put on C) will put on D) has put on
【单选题】In the sentence " He put the covers over his head to silence his quick breathing. " the infinitive is used as ________.
A.
complement
B.
adverbial of purpose
C.
adverbial of result
D.
attributive
【单选题】He ________ his work to spend more time with his son. [ ]
A.
put down
B.
put aside
C.
put in
D.
put away
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