【美文诵读】
Dear Mayor，
I'm sorry to write to you，but I_feel_it_my_responsibility_to_do_so①，because we should pay attention to our living environment while_developing_our_economy②.
Yesterday we were organized by our school to visit the Dongfanghong Chemical Factory, which is a large factory and a main source of tax in our city. However，when we came out from the factory, we saw that the environment nearby was so badly polluted. The water in the river was as black as ink and there were no living things in it.What's_worse③，the trees and the grass were covered with a thick layer of dust.The crops as well as the people living there seemed unhealthy.
