单项选择题

A．In the early part of the 19th century.
B．In the last part of the 19th century.
C．In the 20th century.
D．In the beginning of the 20th century.
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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.
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.
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