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.
单项选择题 The example in the news item is cited mainly to show（）
单项选择题 The tapes of the Apollo 11 mission were first stored in（）
单项选择题 The largest city in Canada is（）
