单项选择题

In order to establish the "fix" or precise location of a ship, the navigator must know ______.

A．his latitude
B．his longitude
C．local time
D．both his latitude and longitude
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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
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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