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单项选择题

A．Fifty students.
B．Forty students.
C．Twenty-five students.
D．Fifteen students.
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单项选择题A．About 200 miles.B．About 1, 000 miles.C．About 7,000 miles.D．About 5,000 miles.

A．About 200 miles.
B．About 1, 000 miles.
C．About 7,000 miles.
D．About 5,000 miles.

单项选择题A．In March.B．In early summer.C．In October.D．In April.

A．In March.
B．In early summer.
C．In October.
D．In April.