《中华人民共和国民用航空法》规定，军用机场不可以作为民用航空器的固定备降机场。
参考答案：错
--- How much homework has your cousin finished?
--- _______ at all. He has sat there the whole morning, doing _______.
A．None; nothing
B．Nothing; none
C．No one; nothing
D．None; none
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