Reading passages

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 --------.
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 

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190 
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 electrified railway systems --------.
A) because they have small populations and the electrified system seemed adequate 
B) to keep their mountain air unpolluted 
C) as other railway systems were not practical in high altitudes 
D) as they wanted to develop a railway system that did not rely on imported fuel 
E) since the only safe braking system on a steep gradient is an electric 
 
Botanic gardens perform a threefold function: to please and educate the public; to 
carry out studies regarding the economic value of native and foreign
plant products and acclimatization of plants; and to act as a place of information for 
scientific research in various fields of botany, such as anatomy, morphology and 
physiology for which museums, libraries and labourers are also needed. The search 
for drugs and spices particularly has tempted men from early times to explore all