单项选择题

From the selection, we may assume that temperature changes ________.

A．affect only ammonia molecules
B．may affect the vibration rate of atoms
C．affect the speed at which the atoms travel
D．do not affect atoms in any way

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单项选择题

An appropriate title for this selection would be ________.

A．A Peacetime Use of the Atom
B．Atoms and Molecules
C．The Satellite Timekeepers
D．The Role of the Clock

单项选择题

The damaging effect of the treatment many American children receive today ________.

A．has not been taken seriously
B．has aroused hot debates
C．is beginning to be recognized
D．is unquestionable