单项选择题

A．It begins on campus.
B．It’s five miles long.
C．It circles the campus.
D．It takes a few days to cover.
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单项选择题
A．A new record.B．An old record.C．A popular record.D．A record of classical music.
A．A new record.
B．An old record.
C．A popular record.
D．A record of classical music.
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.
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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