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【单选题】
有关β-折叠的描述,错误的是
A.
主链骨架呈锯齿状
B.
氨基酸侧链交替位于扇面上下方
C.
由氢键维持稳定,其方向与折叠的长轴大致水平
D.
β-折叠有反平行式结构,也有平行式结构
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参考答案:
举一反三
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A.
冷却水的流量
B.
冷却水的温度
C.
冷却水的流向
D.
冷却水的流速
【简答题】Imagine you are on vacation,Talk about what did you do on vacation. ____________________________________________________________________________________________ _______________________________________...
【单选题】-Can he play the guitar? -_____, and he can play it well. [     ]
A.
Yes, he can.
B.
No, he can't.
C.
Yes, he does.
D.
No, he doesn't.
【简答题】Can you imagine (live) ______ in the desert.
【单选题】________ you have tried it, you can’t imagine
A.
33. ________ you have tried it, you can’t imagine howpleasant it is.  ( 北京 ) A.Unless           
B.
Because         
C.
Although        
D.
When
【单选题】Every director needs an assistant that he can ________ to take care of problems that may occur in his asbsence.
A.
count of
B.
count for
C.
count on
D.
account for
【单选题】As a new diplomat, he often thinks of ______ he can react more appropriately on such occasions.
A.
what
B.
which
C.
that
D.
how
【简答题】A.He can take care of himself. B.He can stay at home. C.He can jump. D.He can parachute.
【单选题】He can hardly swim, _______? [     ]
A.
couldn't he?
B.
can't he
C.
could he
D.
can he
【简答题】---Can Bill play ping-pong? ---_____. He can play it very well. A. Yes,he can    B.Yes, he can’t    C.No, he can’t
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