[原创]23 贡献点JJ M49 V** 准备2战了啊

烨子

还有一个是珠峰测量的"

Lz, is it talking about British team meausred the Himalayas and then how Chinese

scientists improved the acurracy of measuring the mountains?? From GWD??

能不能把这个题发上来分享下　偶米找到的说

babyheartli

是JJ上的一道题,不好意思,我也不记得在哪了,在CD的帖子上看的 好象是22号的一个JJ.

yuhaiping043

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
       efforts to correct for the errors that
(25) had plagued the British. One source
       of error is refraction, 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 refraction 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 refraction 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 reflector
       visible through a theodolite for ten
(50) miles, as a reference 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.

-------------------------------------------------------------
Q32

It can be inferred from the passage that refraction would be most likely to cause errors in measurements of a mountain’s
elevation under which of the following conditions?

A.     When there are local variations in sea level
B.     When light passes through humid air
C.     When theodolites are used relatively far from the mountain peak.
D.     When weather balloons indicate low air temperature and pressure.
E.      When sea level has been carried in to within five to twelve miles of the summit.                           Ans：D

-------------------------------------------------------------
Q33 Which of the following best describes the purpose of the sentence in lines 23-25 (“The Chinese…the British”)?

A.     Introduce a definition
B.     Signal a transition in focus
C.     Summarize the preceding paragraph
D.     Draw a contrast between two different theories.
E.      Present information that contradicts the Preceding paragraph.                                               Ans：B

----------------------------------------------------
Q34
        Which of the following is NOT mentioned as a possible source of error in surveying mountain elevation?

A.     Mirages
B.     Refraction
C.     Inaccurate instruments
D.     Variations in sea level
E.      Uncertainty about the exact point to be Measured                                                          Ans：C

---------------------------------------------------
Q35
        The primary purpose of the passage is to

A.     provide details about improvements to a process
B.     challenge the assumptions underlying a new method
C.     criticize the way in which a failed project was carried out
D.     call for new methods to solve an existing problem
E.      explain the theory behind a new technique                                                                Ans：A