[問題]GWD26-32

[medi66]

Q32 to 35
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.
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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.

Answer: D

CD上的爭議在C D 兩個選項

C選項的定位在Line34-38
D選項的定位在Line25-29

我是比較支持D 不知道各位的想法是如何???

感謝~

[joyce0519]

Answer: D

CD上的爭議在C D 兩個選項

C選項的定位在Line34-38
D選項的定位在Line25-29

我是比較支持D 不知道各位的想法是如何???

我是選C耶,如L34~38所述,如果這段距離較大的話,會使測量不準確,所以要控制在5~12 MILES
至於D,我的理解是在"不同"的壓力和溫度才會造成不準,但D選項在低溫中不代表會有變化,如果都是在低溫中,測量還是準確的
恩繼續討論

[Charleneshen]

以前考試的時候沒做過這題，不過GMAT文章還是挺有趣的，所以跟大家一起討論一下好了，回味一下以前準備考試的感覺。

我覺得答案是C，與其他選項不同的是，C是屬於infer的答案類型，其他的都是直接推導就可以想到的。原因我跟樓上joyce享的一樣，因為氣球的距離會造成設量器壓上的誤差，相對也會造成折射上的誤差。

[ergh]

為何答案不為B?
根據題目所說One source of error is refraction, the bending of
light beams as they pass through air layers of different temperature and pressure.
難道是因為humid的字眼，所以並非具有差異性的溫度嗎？

[Joshuachaos]

為何答案不為B?
根據題目所說One source of error is refraction, the bending of
light beams as they pass through air layers of different temperature and pressure.
難道是因為humid的字眼，所以並非具有差異性的溫度嗎？

沒錯...瞎吧 答案是c啦

[dibert8]

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.
(A) sea level 跳行
(B) 文章裡沒有提 humid air
(C) 定位 line 29~38; mountain peak = Everest's summit
(D) different (變動) =/= low (固定);測量不準的原因是光經過的空氣介質折射率的變動,固定的折射率(因為溫度,氣壓不變)是比較容易計算出距離的.
(E) sea level 不會 carry (是 team 去 carry)

[pimi]

請問以下這句的翻譯
the Chinese team 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.

[purpleme]

Q33.
Which of the following best desceibes the purpose of the sentence in lines23-25("The Chinese...the British")?

A. Introduce a definition
B. Singnal a transition in focus
C. Summarize the preceding paragraph
D. Dreaw a contrast between two different theoires
E. Present information that contradicts the preceding paragraph

請問這題要怎麼看呢?
The Chinese, however, made efforts to correct for the errors that had plagued the British.
這句要怎麼翻比較好勒??