单项选择题


A．which
B．that
C．what
D．when
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单项选择题
According to Fredrick Reid, the aviation industry ______.
A．is facing a very serious situation
B．will confront a difficult evolution
C．has no way out of the present difficulty
D．will experience a radical reform
单项选择题
How many factors could shape public opinion, as mentioned in the text
A．2.
B．3.
C．4.
D．5.
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