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【单选题】
下列哪一种元素不是蛋白质的主要元素?A.
碳
B.
磷
C.
氧
D.
氮
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反馈参考答案：
举一反三
【单选题】We couldn't have passed the final examination ______ your help.
A.
but for
B.
without
C.
if it had not been for
D.
All of the above.
【单选题】________ his overdrinking, the accident would not have happened.
A.
If it weren’t for
B.
But for
C.
Not had it been for
D.
Had it not been for
【单选题】If it ______ for the fence, he ______ into the river.A. were not; fallenB. had not been; could h
A.
41. If it ______ for the fence, he ______ into the river. A. were not; fallen
B.
had not been; could have fallen C were not; could fall D. had not been; could fall
【单选题】It ______ for two days. The roads will be locked if it ______ soon.
A.
snowed, won't stop
B.
has been snowing, doesn't stop
C.
has snowed, won't stop
D.
snow, doesn't stop
【简答题】神经胶质细胞的主要功能是什么?
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