填空题

S4. Why don’t the rocks melt even when the temperature has reached their melting point

【参考答案】

It was due to the pressure of the rock．
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填空题
S3. If the temperature at the earth’s surface is 20F, the temperature in a coal mine 500 feet below the surface would be _____________________.
单项选择题
A．The sun.B．The stars.C．The mountain ranges.D．The clouds.
A．The sun.
B．The stars.
C．The mountain ranges.
D．The clouds.
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