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单项选择题
A．It helps develop our personalities.B．It enables us to acquire first-hand knowledge.C．It makes our life more interesting.D．It brings about changes in our lifestyle.
A．It helps develop our personalities.
B．It enables us to acquire first-hand knowledge.
C．It makes our life more interesting.
D．It brings about changes in our lifestyle.
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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