单项选择题

A．Light speed is millions of times faster than sound speed.
B．Light speed is a million times slower than sound speed.
C．Light speed is about millions of times faster than sound speed.
D．Light speed is about a million times faster than sound speed.
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单项选择题
A．The lack of a qualified sales force.B．Lower price in suburban shopping malls.C．Unpleasant highway commuting.D．Limited land available.
A．The lack of a qualified sales force.
B．Lower price in suburban shopping malls.
C．Unpleasant highway commuting.
D．Limited land available.
填空题
extravagance
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