What should a driver do when ascending?
A) Rise slowly.
B) Breathe faster.
C) Relax completely.
D) Breathe helium.
正确答案：A
答案：A
[试题分析]事实了解题
[详细解答]根据文章的最后一段的最后一句中的“adivermustascendslowly可知答案为A
Whatshouldadriverdowhenascending?A)RiseslowlyB)Bre
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