单项选择题

According to Nigel, most problems of air travel are caused by ______.

A．unfavourable weather conditions
B．airports’ handling capacity
C．inadequate ticketing service
D．overbooking
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单项选择题
What is the purpose of Professor McKay’s report
A．To look into the mental health of old people.
B．To explain why people have negative views on old age.
C．To help correct some false beliefs about old age.
D．To identify the various problems of old ag
单项选择题
Mary doesn’t seem to favour the idea of a new airport because ______.
A．the existing airports are to be wasted
B．more people will be encouraged to travel
C．more oil will be consumed
D．more airplanes will be purchased
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