单项选择题

A．They are necessary for modern man.
B．They are unnecessary for survival.
C．They are as good as computers.
D．They are dangerous for us.
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单项选择题
A．She got home before 9 o’’clock.B．She had a bad cold.C．She had a car accident.D．She was delayed.
A．She got home before 9 o’’clock.
B．She had a bad cold.
C．She had a car accident.
D．She was delayed.
单项选择题
A．To make money.B．To guard the house.C．To enjoy their company.D．To keep them for their grandparents.
A．To make money.
B．To guard the house.
C．To enjoy their company.
D．To keep them for their grandparents.
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