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
单项选择题
A．To give an example that both human beings and animals can recognize faces.B．To tell how a skilled writer could describe all the features of different people.C．To indicate how pigeons and people look different.D．To show how faces are like fingers.
A．To give an example that both human beings and animals can recognize faces.
B．To tell how a skilled writer could describe all the features of different people.
C．To indicate how pigeons and people look different.
D．To show how faces are like fingers.
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