单项选择题

The author mentions all of the following ways to measure time EXCEPT ______.

A．sundial
B．hourglass
C．electric clock
D．mechanical clock

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单项选择题

Which of the following is the best title for this passage

A．The development of Universal Time.
B．Different ways to measure time.
C．Why we measure time the way we do.
D．How the calendar came into being.

单项选择题

What does the example of Babylonia astronomers reveal

A．It reveals Babylonians' wisdom that was absent elsewhere.
B．It reveals the origin of our time measurements.
C．It reveals the limits of some time measurements.
D．It reveals the stability of time measurements.

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