单项选择题

What is the most dangerous thing about nitrous oxides

A．Stagnant air.
B．Damage to concrete.
C．Unfounded fears.
D．Potential carcinogenic effects.
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单项选择题
A．inB．onC．underD．beyond
A．in
B．on
C．under
D．beyond
单项选择题
The woman’’s last inquiry is mainly concerned with
A．the time needed for sending the parcel.
B．the flight time to New York.
C．the parcel destination.
D．parcel collection.
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