单项选择题

A．Too many planes.
B．Weather.
C．Different regions operate differently.
D．All of the above.
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单项选择题
A．He thinks Mr. Smith is mean.B．He respects Mr. Smith very much.C．He wants to go on working for Mr. Smith.D．He thinks Mr. Smith is very generous.
A．He thinks Mr. Smith is mean.
B．He respects Mr. Smith very much.
C．He wants to go on working for Mr. Smith.
D．He thinks Mr. Smith is very generous.
单项选择题
A．150.B．15,000.C．1,500.D．5,000.
A．150.
B．15,000.
C．1,500.
D．5,000.
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