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单项选择题

环境空气质量不达标区域，已实施区域限期达标规划，建设项目应采取（ ）。

A.经济合理的环境保护措施
B.技术可行的环境保护措施
C.国内外先进可行的环境保护措施
D.满足长期达标排放的环境保护措施
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集群体系结构中,不属于网络设施层的是: A.
网络互联结构 B.
负载均衡 C.
通信协议 D.
号技术
多项选择题
以下属于绝对化要求的是()
A、“我必须获得成功”
B、“别人必须很好地对待我”
C、“我可以失败”
D、“生活应该是很容易的”
单项选择题
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 modern 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 back-ground 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) lnay even help people to concentrate.
" Background music" in the passage means .
A.musicplayedintheconcert
B.akindofnoisecomingintoyourears
C.musicwhichhelpspeopletoconcentrate
D.musicplayedwhilepeopleareworking
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