下面关于Original Background Noise（初始底噪配置）描述正确的是（）A、当小区空闲时，把测量得到的RTWP作为底噪初始值B、当小区底噪动态配置开关为关闭，小区的底噪使用该值C、当小区底噪动态配置开关为打开时，该值只是小区底噪的初始值D、该值的配置需要参考P-CPICH

Life gets noisier every day and very few people can free from noise of some sort or another.It doesn′t matter where you live--in the middle of a modem city,or a faraway village--the chances that you will be disturbed by jet aero planes,transistor radios,oil powered engines,etc.,are almost everywhere.We seem to be getting used to noise,too.Some people feel quite lonely without background music while they are working.
Scientific tests have shown that total silence can be very frightening experience for human beings.However,some people enjoy listening to pop music which is very loud,and this can do harm to their eardrums（耳鼓）.The noise level in some disco is far above the usual safety level for heavy industrial areas.
One recent report about noise and concentration（专心）suggested that although a lot of people say that any noise disturbs their concentration,what really affects their ability to concentrate is a change in the level of noise.It goes on to say that a background noise,which doesn′t change too much（music,for example）may even help people to concentrate.

From this passage,the pollution of noise

A.doesn't matter much
B.has become worse everywhere
C.has become better in big cities
D.has become better in villages