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15 March, 15:59

Read this excerpt from "The City Without Us" by Alan Weisman:

Enemy number one is the salt that highway departments spread on the roadways each winter - ravenous stuff that keeps eating steel once it's done with the ice. Oil, antifreeze, and snowmelt dripping from cars wash salt into catch basins and crevices where maintenance crews must find and flush it. With no more people, there won't be salt. There will, however, be rust, and quite a bit of it, when no one is painting the bridges.

Which sentence best states the main idea of this section of the chapter?

A. Salt flushing and painting rusty bridges consume a large part of a city's budget.

B. Salt and rust are corrosives that have damaging effects on a city's infrastructure.

C. Salt is the most damaging compound that people can use to fight snow and ice.

D. Salt can be used as a metaphor for a monster that has a voracious appetite.

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  1. 15 March, 18:16
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    The sentence which best state the main idea of the section given above is the one written in option C. Option C is the correct answer. The passage given above is talking about the substances that can destroy the structures of highways; and he described salt as enemy number one. This means that, salt is the most damaging compounds of all the substances that people use to combat snow and ice.
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