单项选择题

According to the passage, a murder would most likely occur ________.

A．on a weekend night in winter
B．on a weekday afternoon in summer
C．on a weekend night in summer
D．on a weekday night in winter
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单项选择题
Implied but not stated: ________.
A．precise timekeeping is essential in science
B．scientists expect to disprove Einstein’s relativity theories
C．atomic clocks will be important in space flight
D．the rate of vibration of an atom never varies
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
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