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【单选题】
化学致癌物的致癌作用不具有下列哪一特点( )A.
剂量越大,肿瘤发生率越高
B.
潜伏期长
C.
致癌是一个多阶段的复杂过程
D.
某些化学致癌物仅起激发作用
E.
同一种化学致癌物只引起某种组织肿瘤
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举一反三
【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.
【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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