GMAT考试资料：GWD试题合集（四十五）.

　　以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　25. GWD-26-Q32-Q35 中国人改进了英国人测量珠峰高度的方法

　　In 1975 Chinese survey teams

　　remeasured Mount Everest, the highest

　　of the Himalayan mountains. Like the

　　Line British in 1852, they used the age-old

　　(5) technique of “carrying in” sea level:

　　surveyors marched inland from the

　　coast for thousands of miles, stopping

　　at increments of as little as a few feet

　　to measure their elevation, and mark-

　　(10) ing each increment with two poles.

　　To measure the difference in elevation

　　between poles, surveyors used an

　　optical level—a telescope on a level

　　base—placed halfway between the

　　(15) poles. They sighted each pole, read-

　　ing off measurements that were then

　　used to calculate the change in eleva-

　　tion over each increment. In sight of

　　the peaks the used theodolites—

　　(20) telescopes for measuring vertical and

　　horizontal angles—to determine the

　　elevation of the summit.

　　The Chinese, however, made

　　forts to correct for the errors that

　　(25) had plagued the British. One source

　　of error is rraction, the bending of

　　light beams as they pass through air

　　layers of different temperature and

　　pressure. Because light traveling.

　　(30) down from a summit passes through

　　many such layers, a surveyor could

　　sight a mirage rather than the peak

　　itself. To reduce rraction errors, the

　　Chinese team carried in sea level to

　　(35) within five to twelve miles of Everest’s

　　summit, decreasing the amount of air

　　that light passed through on its way to

　　their theodolites. The Chinese also

　　launched weather balloons near their

　　(40) theodolites to measure atmospheric

　　temperature and pressure changes

　　to better estimate rraction errors.

　　Another hurdle is the peak’s shape.

　　When surveyors sight the summit.

　　(45) there is a risk they might not all

　　measure the same point. In 1975

　　the Chinese installed the first survey

　　beacon on Everest, a red rlector

　　visible through a theodolite for ten

　　(50) miles, as a rerence point. One

　　more source of error is the uneven-

　　ness of sea level. The British

　　assumed that carrying in sea level

　　would extend an imaginary line from

　　(55) the shore along Earth’s curve to a

　　point beneath the Himalaya. In

　　reality, sea level varies according

　　to the irregular interior of the planet.

　　The Chinese used a gravity meter to

　　correct for local deviations in sea level.

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（四十四）

2.GMAT考试资料：GWD试题合集（四十三）

3.GMAT考试资料：GWD试题合集（四十二）

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