单项选择题

Which of the following would be the most appropriate title for the passage

A．The Properities of Gases and Liquids.
B．What Fluids and Gases Are Made of.
C．New Uses for the Gas and the Liquid.
D．New Theories about Fluids and Gases.

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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

It can be inferred from the passage that the gases of the Earth's atmosphere are contained by ______.

A．a closed surface
B．the gravity of the planet
C．the field of space
D．its critical point