皮皮学，免费搜题
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【单选题】
锅炉本体由汽锅和( )两部分组成A.
省煤器
B.
空气预热器
C.
炉子
D.
水泵
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【简答题】____________(环境一旦造成破坏), it takes many years for the system to recover.
【简答题】常用的果蔬汁澄清方法?
【单选题】By the time she takes the entrance examination, Louis ______ Spanish for five years.
A.
had been studying
B.
has studied
C.
will have been studying
D.
will study
【单选题】Many people believe that _______ will takes years to develop a car that does not pollute the air.
A.
it
B.
that
C.
there
D.
this
【简答题】Once environmental damage ________, it takes many years for the system to recover. A) has done B) is to do C) does D) is done
【简答题】_____________(环境一旦遭到破坏)，it takes many years for the system to recover
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