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.
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单项选择题
A．Watches became less important because factories had clocks.B．Watches were of higher quality than ever before.C．More clocks were manufactured than watches.D．The availability of watches increased.
A．Watches became less important because factories had clocks.
B．Watches were of higher quality than ever before.
C．More clocks were manufactured than watches.
D．The availability of watches increased.
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