[求助] GWD-26-Q32-Q35 好像没讨论过啊？？？

1.        GWD-26-Q32-Q35

   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增加 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.

-------------------------------------------------------------

Which of the following best describes the

purpose of the sentence in lines 23-25

(“The Chinese…the British”)? C

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.

答案是B  为甚么啊   文中怎么没有啊

The primary purpose of the passage is to   C

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

 答案是A    那提到  a process

Q33问的是段落关系，前面一段讲了中国人又测了珠峰,then this paragraph is talking about chinese this time correct some error happend in English's measure. focuschanged,

A.     Introduce a definition : Nothing to do with definition

C.     Summarize the preceding paragraph :Nothing to do with summarize

D.     Draw a contrast between two different theories: it is not contrast, also not about theories, it is about method 

E.      Present information that contradicts the Preceding paragraph. again, it is not contrast, only the transition of focus

eliminate the wrong answer, then you got it!