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
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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.
单项选择题
According to Papousek the pleasure babies get in achieving something is a reflection of ______.
A．the satisfaction of certain physiological needs
B．their strong desire to solve complex problems
C．a basic human desire to understand and control the world
D．a fundamental human urge to display their learned skills
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