【正确答案】Dear Sirs,
I am writing to complain about a chemical plant which contaminates the nearby river. Every day the plant drains a surprisingly large amount of waste liquids into it. The water in it has become gray and gives off a strong smell.
I think the local authorities should adopt several strong measures to deal with the public hazard. Firstly, it is necessary to prohibit the plant from discharging waste water into the river before it is purified. Secondly, a series of environment protection rules need to be laid down. Those who violate them deserve to be fined heavily.
Hoping the problem will be solved as soon as possible.
Thanks for your attention.