单项选择题

A．English.
B．History.
C．Biology.
D．Geology.
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单项选择题
A training camp is held the week before the Swiss Alpine Races.
A．Y
B．N
C．NG
单项选择题
A．Two years.B．Three years.C．Four years.D．Two to four years.
A．Two years.
B．Three years.
C．Four years.
D．Two to four years.
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