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

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

单项选择题

The babies Would smile and bubble at the lights because ______.

A．they succeeded in "switching on" the light
B．the sight of the lights was interesting
C．they need not turn back to watch the lights
D．the lights were directly related to some basic "drives”