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【单选题】
下列关于RNA和DNA聚合酶的叙述哪一项是正确的:A.
所有RNA聚合酶和DNA聚合酶只能在生长中的多核苷酸链的3′端加接核苷酸
B.
RNA聚合酶需要引物，并在延长链的5′端加接碱基
C.
DNA聚合酶可在链的两端加接核苷酸
D.
DNA仅能以RNA为模板合成DNA
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A.
requirement
B.
qualification
C.
permission
D.
demand
【单选题】He doesn't do his homework _____ , though he has _____ . [ ]
A.
carefully enough , enough time
B.
enough carelessly, time enough
C.
carelessly enough, enough time
D.
enough carefully,enough time
【单选题】He was lucky enough to sell his car for exactly ______.
A.
where he had paid for it
B.
what he had paid for it
C.
what he was paid for it
D.
which he had paid for it
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A.
was enough lucky to
B.
was lucky enough to
C.
was to enough lucky
D.
was lucky to enough
【单选题】He doesn’t do his homework ________, though he has ________.
A.
carefully enough; enough time
B.
enough careful; time enough
C.
careful enough; enough time
D.
enough carefully; time enough
【单选题】He didn’t think the shirt ________,so he didn’t buy it.
A.
enough cheap
B.
enough expensive
C.
cheap enough
D.
expensive enough
【单选题】He’s lucky enough to have many people ___ him with the work.
A.
help
B.
to help
C.
helped
D.
helping
【单选题】Thanks to his open-minded parents and schoolmaster, he was lucky enough to grow up the positive impact of sports.
A.
exposed to
B.
to expose to
C.
being expose to
D.
having exposed to
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