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【多选题】
为了防止电梯超速,电梯安装了( )和( )。A.
限速器
B.
缓冲器
C.
D.
过载保护
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举一反三
【单选题】______ the serious sandstorms that have hit the city recently, the quality of the air in Beijing is very poor. [ ]
A.
Apart from
B.
Due to
C.
Instead of
D.
Thanks to
【单选题】The topic in the sentence “Air pollution in Beijing is due to a number of reasons” is__________.
A.
air pollution in Beijing
B.
due to
C.
a number of reasons
D.
the reason for air pollution
【单选题】Cleaner heating system will in Beijing to control air pollution.
A.
be established
B.
be sent
C.
be covered
【单选题】Cars cause most of Beijing's air pollution. So the 'No Car Day' campaign (活动)asks Beijing drivers _____ their cars at home one day each month. [ ]
A.
leave
B.
leaving
C.
to leave
【单选题】The controlling idea in the sentence “Air pollution in Beijing is due to a number of reasons” is__________.
A.
air pollution in Beijing
B.
due to
C.
a number of reasons
D.
the reason for air pollution
【单选题】Cars cause most of Beijing's air pollution. So the 'No Car Day'campaign (活动) asks Beijing drivers _____ their cars at home one day each month. [ ]
A.
leave
B.
leaving
C.
to leave
D.
to be left
【单选题】Last month, John arrived in Beijing __ . [ ]
A.
by air
B.
by a air
C.
by a plane
D.
take a plane
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