单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Staying long outside.
B．Working overtired.
C．Working with patients.
D．Wearing few clothes.
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单项选择题
A．It is not safe for the children.B．The children can not communicate with mothers face to face.C．The mothers may feel very tired.D．The children have no chance to use hands and legs.
A．It is not safe for the children.
B．The children can not communicate with mothers face to face.
C．The mothers may feel very tired.
D．The children have no chance to use hands and legs.
单项选择题
A．It can not be stopped properly.B．The brakes got loose.C．It can not start up.D．The engine tends to die.
A．It can not be stopped properly.
B．The brakes got loose.
C．It can not start up.
D．The engine tends to die.
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