单项选择题

A．It was fashionable to wear them.
B．They were inexpensive.
C．They were a sign of wealth.
D．It was important to be on time.
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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.
填空题
O
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