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．100 million.B．70 million.C．67 million.D．50 million.
A．100 million.
B．70 million.
C．67 million.
D．50 million.
单项选择题
A．Sarah moved to a new address a week ago.B．Sarah misses her family very much.C．They should pay Sarah a visit.D．They should stop seeing Sarah.
A．Sarah moved to a new address a week ago.
B．Sarah misses her family very much.
C．They should pay Sarah a visit.
D．They should stop seeing Sarah.
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