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1. |
%_Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:_% |
A. | 10% of the air molecules in the atmosphere |
B. | 25% of the air molecules in the atmosphere |
C. | 50% of the air molecules in the atmosphere |
D. | 75% of the air molecules in the atmosphere |
Answer» D. 75% of the air molecules in the atmosphere | |