单项选择题

In relation to the earth, the sun will move _____________.

A．7,000 miles per hour
B．fifteen degrees in one hour
C．1/48th of the world's circumference
D．twice as far as Polaris
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单项选择题
A navigator's chronometer will always show _____________.
A．Greenwich time
B．noon time
C．local time
D．sun time
单项选择题
The cause for the heat in the interior of the earth is _____________.
A．not determined
B．the great pressure of the earth
C．radioactive elements
D．the heat remaining from the formation of the earth
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