单项选择题

A．3 times.
B．6 times.
C．9 times.
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单项选择题
According to the passage , what happens when the temperature is increased in a closed container holding a liquid
A．The liquid and the gas phases become more similar.
B．The liquid and the gas become less dense.
C．The container expands.
D．The liquid evaporates out of the container.
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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