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Answer to question 18: (b) Avoid altitude sickness. Sleeping lower than the highest elevation you climbed to (the same day) helps your body adjust altitude.
19.You’re climbing a 17,000-foot pass in Nepal. To prevent altitude sickness, you should…
a)Ascend slowly, so your body adjusts
b)Ascend quickly, so you spend as little time as possible above 14,000 feet