Paragraph 3 _________.
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A The Definition and the Description of the Ions B The Definition and the Description of the Stratosphere C The Sun’s Rays D Recent Studies of the Upper Atmosphere VS Past Studies E The Definition and the Description of the Troposphere F The Composition of the Atmosphere
7 .Paragraph 4 _________.
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9 .Life as we know exists on the earth because the atmosphere ___________.
A contains a layer of ozone gases B about 42 degrees colder than on the ground C 21% oxygen by weight D less than 1% of xenon by volume E about 75 degrees colder than in Interlaken F is warmed by the earth’s heat.
10 .The atmosphere consists of ___________.
A contains a layer of ozone gases B about 42 degrees colder than on the ground C 21% oxygen by weight D less than 1% of xenon by volume E about 75 degrees colder than in Interlaken F is warmed by the earth’s heat.
