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．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.
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.
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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