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 on the surface of the desert.
D．To use the oil left in the oil lakes.
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单项选择题
The difficulty to control the AIDS is that the vaccines are very expensive.
A．Y
B．N
C．NG
填空题
opportunity
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