单项选择题


When is the next meeting

A． In an hour.
B． Next week.
C． In one month.
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单项选择题
What color is the woman’s umbrella
A． Blue.
B． Black.
C． Green.
单项选择题
According to the passage, the difference between a gas and a liquid under normal conditions on Earth is that the liquid ______ .
A．is affected by changes in pressure
B．has a permanent structure
C．forms a free surface
D．is considerably more common
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