The oxygen equipment made it possible for the climbers to rest and sleep at very high ______.

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问题 The oxygen equipment made it possible for the climbers to rest and sleep at very high ______.

选项 A、latitude
B、altitude
C、level
D、hemisphere

答案B

解析 altitude高度;高处;海拔。latitude纬度,纬度地区。level水平;标准。hemisphere半球。
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