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 解决：安装一个红色灯塔。
beacon on Everest, a red reflector
visible through a theodolite for ten
(50) miles, as a reference point. One 误差3：海平面不平。
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 解决：用重力计改正误差。
correct for local deviations in sea level.
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Q32:It can be inferred from the passage thatrefraction would be most likely to cause errors in measurements of a mountain’selevation under which of the followingconditions?
A.When there are local variations in sealevel
B.When light passes through humid air
C.When theodolites are used relatively farfrom the mountain peak.
D.When weather balloons indicate low airtemperature and pressure.
E.When sea level has been carried in to within five to twelve miles of the summit.
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Q33: Which of the following best describes thepurpose 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.
-----------------------------------------------------------------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 bemeasured
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Q35: The primary purpose of the passage is to
A.provide details about improvements to a process
B.challenge the assumptions underlying anew method
C.criticize the way in which a failed projectwas carried out
D.call for new methods to solve an existing problem
E.explain the theory behind a new technique