单项选择题

A navigator's chronometer will always show _____________.

A．Greenwich time
B．noon time
C．local time
D．sun time
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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
单项选择题
From the information given in the passage, most minerals would melt fastest _____________.
A．at 4,000°F, 5,000 feet below sea level
B．in the absence of oxygen
C．at 4,000°F, 5,000 feet above sea level
D．at the exact center of the earth at 4,000°F
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