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我觉得应该是D吧?作者首先谈到了引起REFRACTION的原因,影响因素最大的就是 DIFFERENT TEMPERATURE AND PRESSURE. One source of error is refraction, the bending of light beams as they pass through airlayers of different temperature and pressure. Because light traveling down from a summit passes through many such layers, a surveyor could sight a mirage rather than the peak itself. 接下来,作者说为了减少这个error带来的测量误差,他们carried in sea level to within five to twelve miles of Everest’s summit, decreasing the amount of air that light passed through on its way to their theodolites.
题目问的是refraction would be most likely to ((cause errors ))in measurements of a mountain’selevation under which of the followingconditions? 空气的不同温度和气压才是CAUSE ERROR的元首。减少通过的空气只是为了减少误差,怎么能说是cause呢。 我是这么想的,不知道对不对~请大家指正 |
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