A．An artificial sunB．The artificial stars.C．A bird that-找考题网

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A．An artificial sun
B．The artificial stars.
C．A bird that spent its lifetime in a cage.
D．A bird that had never flown under a natural sky.

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S3. If the temperature at the earth’s surface is 20F, the temperature in a coal mine 500 feet below the surface would be _____________________.

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