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 subject of this passage is the _____________.
A．interior of the earth
B．results of volcanic action
C．work of geologists
D．formation of volcanoes
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