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【单选题】
下列关于酶活性中心的正确叙述的是:( )A.
所有的酶至少有一个活性中心
B.
所有酶的活性中心都是不带电荷的
C.
所有抑制剂都直接作用于活性中心
D.
酶的必需基团均存在于活性中心内
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反馈参考答案：
举一反三
【单选题】_____ there ______ housework for your mum at your home? [ ]
A.
Are; too many
B.
Is; too many
C.
Are; too much
D.
Is; too much
【单选题】Your mum says we shouldn't watch TV. [ ]
A.
too much
B.
much too
C.
too many
D.
many too
【单选题】—Don’t eat sweets. They are bad for your eyes. —OK, Mum. [ ]
A.
too many
B.
too much
C.
too small
D.
too large
【单选题】Mum, my trousers are too old. I want to buy a new ______.
A.
trousers
B.
one
C.
it
D.
pair
【简答题】—You eat too much __________. It’s not healthy food. —OK, Mum.
【单选题】—Be careful, ________ you will make mistakes in your exams. —I know that, Mum. One can never be too careful. [ ]
A.
and
B.
or
C.
nor
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