C. Noise is a major problem and has not yet been recognized as such.
D. Noise is a major problem about which nothing can be done.
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 peoples 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
答案:ACCDD
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