Reading passages

 
The greatest advantage of electrification on 
railways is that it is both pleasant and efficient. It 
brings the removal of a smoke nuisance from 
tunnels and from the vicinity of larger cities. 
Moreover, owing to high acceleration, it is 
possible to provide a more frequent and faster 
service on densely populated suburban lines. The 
track capacity is improved by electrification on 
mountainous lines because of increase of speed 
both up and down the gradient, generally using 
electric forms of braking in the latter case. Some 
of the major electrification schemes of the world, 

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123 
for example those in Switzerland and Sweden, 
have been emerged owing to the desire to operate 
the railway system without dependence upon 
imported fuel.
 
271- It is pointed out in the passage that the 
benefits of electric railway reaction ——.
A) cover a cleaner environment and an improved 
performance 
B) are confined to mountainous areas 
C) do not outweigh the problems involved 
D) have only recently become apparent 
E) can best be seen in Sweden 
272- The author states that on mountainous lines 
the track capacity is improved by electrification --
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A) and the safety aspect is causing much concern 
B) however, upkeep expenses are high 
C) as it enables trains to go faster both up and 
down the line 
D) yet, this is not the case in other locations 
E) unless electric forms of breaking are used 
273- In the passage, it maintained that Sweden 
and Switzerland have one of the world's major