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【单选题】
蛋白质分子中α-螺旋的特点是A.
靠盐键维持稳定
B.
肽键平面充分伸展
C.
螺旋中的氢键与中心轴基本平行
D.
氨基酸残基的侧链位于螺旋的内侧
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举一反三
【简答题】机场控制区应当根据安全保卫需要，划定为候机隔离区、（）、）和（）、（）等，并分别设置安全保护设施和明显标志。
【单选题】Most of the crops are sold the market place.
A.
in a high price on
B.
with fair price at
C.
at a fair price in
【简答题】There is an accident at the outskirts of Central Park.
【单选题】the bad weather, most of the crops are rotted away.
A.
As the result of
B.
As a result of
C.
As a matter of fact
D.
As a result
【单选题】______ for a long time, most of the crops in this area died from lacking water.
A.
Being no rain
B.
There was no rain
C.
To be no rain
D.
There being no rain
【单选题】stop【C6】______motorists and help when there is an accident.
A.
resting
B.
tired
C.
speeding
D.
drunken
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