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看到本月悦读鸡精中第五篇只有原文和题目，找出了GWD的RC解说和答案，大家可以参考一下，方便考试准备和复习。1. 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 1975年中国人量度珠峰，使用的
remeasured Mount Everest, thehighest
技术和1852年英国人的相同。of the Himalayan mountains. Like the 他们从海岸线开始行进，每隔几
Line British in 1852, they used the age-old 步量度一次上升高度。
(5) technique of “carrying in” sea level:
surveyors marched inland from the
coast for thousands of miles, stopping
atincrements of as little as a few feet
tomeasure their elevation, and mark-
(10) ing each increment with two poles.
To measure thedifference in elevation 使用工具：置于两根杆中间的望
between poles,surveyors used an 远镜。
optical level—atelescope on a level
base—placedhalfway between the
(15) poles. They sighted each pole, read-
ing offmeasurements that were then
used tocalculate the change in eleva-
tion over eachincrement. In sight of 看到峰顶时，他们使用经纬仪
the peaks they usedtheodolites— 探定顶点的上升。
(20) telescopes for measuring vertical and
horizontal angles—to determine the
elevation of the summit.
The Chinese,however, made 但中国人努力改正英国人的误
efforts tocorrect for the errors that 差。
(25) had plagued the British. One source 误差1：由于不同温度压力造成
of error isrefraction, the bending of 的光折射。这会产生峰顶幻象。
light beams as they pass through air
layers of different temperature and
pressure. Because light traveling.
(30) down from a summit passes through
many suchlayers, a surveyor could
sight a miragerather than the peak
itself. Toreduce refraction errors, the 解决：1，减少通过经纬仪的光，
Chinese teamcarried in sea level to 2，使用天气气球测量温度压力。
(35) within five to twelve miles of Everest’s
summit, decreasing the amount of air
that lightpassed through on its way to
theirtheodolites. The Chinese also
launchedweather balloons near their
(40) theodolites to measure atmospheric
temperature andpressure changes
to betterestimate refraction errors.
Another hurdleis the peak’s shape. 误差2：测量者们的测量点不同。
When surveyorssight the summit.
(45) there is a risk they might not all
measure thesame point. In 1975
the Chineseinstalled the first survey 解决：安装一个红色灯塔。
beacon onEverest, a red reflector
visible througha theodolite for ten
(50) miles, as a reference point. One 误差3：海平面不平。
more source oferror is the uneven-
ness of sealevel. The British
assumed thatcarrying in sea level
would extend animaginary line from
(55) the shore along Earth’s curve to a
point beneaththe Himalaya. In
reality, sealevel varies according
to theirregular interior of the planet.
The Chineseused a gravity meter to 解决：用重力计改正误差。
correct forlocal 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 variationsin sea
level
B. When light passes through humidair
C. When theodolites are usedrelatively far
from themountain peak.
D. When weather balloons indicate low air
temperature and pressure.
E. When sea level has been carriedin to
Within five totwelve miles of the summit.
-------------------------------------------------------------
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 precedingparagraph
D. Draw a contrast between twodifferent
theories.
E. Present information thatcontradicts the
Precedingparagraph.
----------------------------------------------------
Q34
Which of the following is NOT mentioned asa
possible source of error in surveyingmountain
elevation?
A. Mirages
B. Refraction
C. Inaccurate instruments
D. Variations in sea level
E. Uncertainty about the exactpoint to be
Measured
---------------------------------------------------
Q35
The primary purpose of the passage is to
A. provide details about improvements to a
process
B. challenge the assumptionsunderlying a
new method
C. criticize the way in which afailed project
was carried out
D. call for new methods to solvean existing
problem
E. explain the theory behind a newtechnique |
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发表于 2012-7-29 20:29:02
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