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.
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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.
填空题
A
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