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【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】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】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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