单项选择题

A．Going to bed earlier.
B．Working even harder.
C．Reading more books.
D．Finding its cause.
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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.
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.
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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