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.
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单项选择题
A．Stay inside.B．Join the man.C．Do some experiments.D．Write some letters.
A．Stay inside.
B．Join the man.
C．Do some experiments.
D．Write some letters.
单项选择题
A．To search for the missing people.B．To investigate a fire on one of the islands.C．To look for the missing woman.D．To rescue the British soldiers.
A．To search for the missing people.
B．To investigate a fire on one of the islands.
C．To look for the missing woman.
D．To rescue the British soldiers.
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