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【单选题】
水分子通过( )的作用可与另外4个水分子配位结合形成正四面体结构。A.
力
B.
氢键
C.
盐键
D.
二硫键
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举一反三
【单选题】. They did everything they could to prevent the pollution ______ the river.
A.
protecting
B.
to protect
C.
from being protected
D.
from protecting
【单选题】If more short journeys were made by bicycles, energy could be saved and pollution ______.
A.
declined
B.
reduced
C.
dropped
D.
decreased
【单选题】_____ we were worried about was _____ they could manage to control the pollution. [ ]
A.
That; how
B.
What; whether
C.
That; whether
D.
What, that.
【简答题】主人公( )是骑自行车时被( )撞死的。
【单选题】It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.
A.
how
B.
whether
C.
that
D.
where
【简答题】主人公 ( ) 是骑 自行车时被 ( ) 撞死的。
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