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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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

单项选择题

If the temperature at the earth's surface is twenty degrees Fahrenheit, the temperature in a coal mine 500 feet below the surface would, in degrees, be ______.

A．50
B．40
C．30
D．120