单项选择题

Apart from a handful of weather stations, within 2 000 miles of the South Pole there is hot a single tree, industry, or ______.

A．habitation
B．settlement
C．residence
D．accommodation
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单项选择题
The agency,______ to set and enforce health standard for American workers, has been promising a cotton dust standard for several years.
A．which is
B．which it is
C．whose job it is
D．whose job is
单项选择题
A convenient way is to set the food on a piece of aluminum oil, ______to the air for half an hour, and then cover it with a dish.
A．let it stay open
B．let it stay opened
C．letting it stay open
D．letting it stay opened
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