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【单选题】
下列那一项符合“诱导契合”学说:A.
酶与底物的关系如锁钥关系
B.
酶活性中心有可变性，在底物的影响下其空间发生一定的改变，与底物进行反应
C.
底物结构朝着适应活性中心方向改变而酶的不发生改变
D.
底物类似物不能诱导酶分子的改变
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【单选题】听力原文：M: I don't like picnics because hamburgers and salad are so messy. W: You worry too much about how you look. It doesn't matter if your fingers get a little dirty once in a while. Q: Why doesn't t...
A.
He doesn't like to eat outdoors.
B.
He prefers to eat with a knife and fork.
C.
He has to eat with his hands.
D.
He hates hamburgers and salad.
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A.
don’t need
B.
needn’t to
C.
needn’t
D.
not need
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