扫描二维码，直接登录
题库 / GmatLaCourse-SC-64
In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which had raised the humidity within them to such levels that salt from the stone was crystallizing and fungus was growing on the walls.
due to moisture exhaled by tourists, which had raised the humidity within them to such levels that salt from the stone was crystallizing
because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
略
略
略
题目分析：
两个选项在原因状语部分的核心词不同。(A)中的核心词是moisture，(B)中的核心词为raise。在逻辑上，金字塔关门的原因肯定是因为湿气上升这种行为，而不是某种湿气，答案为(B)。