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executive
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单项选择题
A．To pull a train.B．To drive a paddle steamboat.C．To get water from ground and turn the wheels of mills.D．To do nothing.
A．To pull a train.
B．To drive a paddle steamboat.
C．To get water from ground and turn the wheels of mills.
D．To do nothing.
填空题
Observation posts have been set up alongside the most dangerous craters to ______.
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