单项选择题

As a general rule. September is the worst month of the year for hurricanes in the Gulf（）.

A．Normally
B．On rare occasions
C．Invariably
D．Sometimes

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单项选择题

Jim was a stout old gentleman, with a weather-beaten countenance（）.

A．body
B．skin
C．shoulder
D．passionate interest

单项选择题

The space shuttle program entails the use of sophisticated technology（）.

A．enhances
B．develops
C．creates
D．involves

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