4.The author condemns noise essentially because it ___.

　　A.is against the law

　　B.can make some people irritable

　　C.is a nuisance

　　D.in a ganger to people’s health

　　5.The author would probably consider research about the effects noise has on people to be ___.

　　A.unimportant

　　B.impossible.

　　C.a waste of money

　　D.essential

　　第十五篇答案：ACCDD