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．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．To restore the normal production of the oil wells.B．To estimate the losses caused by the fires.C．To remove the oil left in the desert.D．To use the oil left in the oil lakes.
A．To restore the normal production of the oil wells.
B．To estimate the losses caused by the fires.
C．To remove the oil left in the desert.
D．To use the oil left in the oil lakes.
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