单项选择题

A．At the end of the online catalogue.
B．At the Reference Desk.
C．In The New York Times.
D．In the Reader’’s Guide to Periodical Literature.
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单项选择题
A．It affects the growth of trees.B．It has been increasing since the Ice Age.C．It is determined by the chemicals in the air.D．It follows a certain cycle.
A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
单项选择题
A．It affects the growth of trees.B．It has been increasing since the Ice Age.C．It is determined by the chemicals in the air.D．It follows a certain cycle.
A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
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