单项选择题

A．The police could be informed about them.
B．The engine of their boat could be repaired.
C．They did not have to light more fires.
D．They could be rescued.
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单项选择题
A．Bean.B．Wheat.C．Rice.D．Corn.
A．Bean.
B．Wheat.
C．Rice.
D．Corn.
单项选择题
A．When we are tired.B．When we have a balanced diet.C．When we can relax.D．When we do regular exercise.
A．When we are tired.
B．When we have a balanced diet.
C．When we can relax.
D．When we do regular exercise.
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