单项选择题

Tell him he should stop () and get some sleep.

A．worry
B．to worry
C．worrying
D．from worrying

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单项选择题

What problem may be caused by planting chips in the human body()

A．People will be controlled by computers.
B．Computers could send out wrong information.
C．Chips can be the cause of diseases.
D．Information may be used improperly.

单项选择题

43().

A．Normally
B．Especially
C．Gradually
D．Nearly