On the average, for every 1000 feet altitude increase, temperature will decrease approximately _______ ℃．

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On the average, for every 1000 feet altitude increase, temperature will decrease approximately _______ ℃．

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The policemen are searching for the ____car on the highway.

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The average height for 850hpa, 700hpa and 500hpa weather chart is_______respectively.

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___alone, I turned on the radio for company。

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The captain and his crews depended on the( )of navigation- the compass for orientation.

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