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.

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

Explanation: in a text, a main idea is important information that tells more about the overall idea of a paragraph or section of a text. In the given excerpt from "The City Without Us” by Alan Weisman we can see the description of how the salt used on the roadways on winter, is very corrosive because it eats steel, and it also says that with no people, there won't be salt, but there will be rust which is also corrosive. According to this information, the main idea of the paragraph is best represented by option B: Salt and rust are corrosives that have damaging effects on a city’s infrastructure.

there on the beach was a struggling turtle.   around its bright green neck was a loop of soda can rings.   in order to the planet, i have made a few changes to my life.   the first change is reducing the number of straws used. the second change was to recycle.   finally, i have worked hard to clean up litter.   it is important to clean our ocean.

you may not think straws have a large impact but they do.   imagine for every straw you sip out of a poor, , adorable turtle is being harmed.   one way i chipped in to is by using metal straws.   these straws are reusable and inexpensive.   another change is simply turning down straws.   by refusing a straw, i’m the turtles one drink at a time.  

however, the ocean just doesn't have turtles.   there are lots of creatures that live there and are harmed by all the litter.   to prevent litter from growing it’s important to recycle.   for me, i have started to buy most goods that are made out of recycled material.   pura vidas, chacos, purses, and too many other items to even count.   plus, when you buy those products they give money to charities.   not only am i the environment, but i’m also feeling better about my self.   finally, i have worked hard to clean up litter.   it is important to clean our ocean.

explanation:

go i think this should he the answer i'm not sure