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单项选择题
A．They are accurate and easy to pull.B．Their shooting range is 40 yards.C．They are usually used indoors.D．They took 100 years to develop.
A．They are accurate and easy to pull.
B．Their shooting range is 40 yards.
C．They are usually used indoors.
D．They took 100 years to develop.
单项选择题
A．It follows a certain cycle.B．It affects the growth of trees.C．It has been increasing since the Ice Age.D．It is determined by the chemicals in the air.
A．It follows a certain cycle.
B．It affects the growth of trees.
C．It has been increasing since the Ice Age.
D．It is determined by the chemicals in the air.
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