MCQOPTIONS
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MCQOPTIONS
| 1. |
Why is it more difficult to breathe on mountains than on planes? |
| A. | As altitude increases, the air pressure decreases and the need for oxygen increases. |
| B. | Mountain air is heavy, and cannot even enter the lungs |
| C. | Mountain air is impure, so we cannot take |
| D. | none of the above |
| Answer» B. Mountain air is heavy, and cannot even enter the lungs | |