由两个物体组成的物体系统，共具有（）独立的平衡方程。A.3 B.4 C.5 D.6

下列各句中，没有语病的一句是[ ]

A．相关部门公布了19家存在大量低俗内容的网站的名单，能否采取有力措施坚决遏制网上低俗风蔓延，是保护未成人健康成长、推动互联网健康有序发展的关键。

B．最近一些与人民生活密切相关的商品和服务价格上涨较快，部分地区和行业出现了经营者串通涨价、哄抬价格和变相提价，扰乱了正常的市场经济秩序。

C．日本丰田汽车的质量问题日益突出，“脚垫门”、“加油踏板门”等相继出现，原因是过度扩张、忽视质量问题造成的，丰田“召回门”事件无疑给国内的一些汽车企业敲响了警钟。

D．人们普遍担心，迟早要出现的克隆人将从根本上改变人类数百万年的两性生殖方式，使人类在伦理、道德、法律等方面遭遇巨大挑战。

研磨圆柱孔用的研磨棒，其长度为工件长度的()倍。

A、1～2 

B、1.5～2 

C、2～3 

D、3～4

阅读理解。

     A simple piece of clothesline hangs between some environmentally friendly Americans and their neighbors.

     On one side stand those who see clothes dryers (干衣机) as a waste of energy and a major polluter of the

environment. As a result, they are turning to clotheslines as part of the "what-I-can do environmentalism (环境

保护主义)."

     On the other side are people who are against drying clothes outside, arguing that clotheslines are unpleasant

to look at. They have persuaded Homeowners Associations (HOAs) access the U.S. to ban outdoor clotheslines,

because clothesline drying also tends to lower home value in the neighborhood. This had led to a Right-to-Dry

Movement that is calling for laws to be passed to protect people's right to use clotheslines.

     So far, only three states have laws to protect clothesline. Right-to-Dry supporters argue that there should

be move.

     Matt Reck, 37, is the kind of eco-conscious (有生态意识的) person who feeds his trees with bathwater

and reuses water drops from his air conditioners to water plants. His family also uses a clothesline. But on July

9, 2007, the HOA in Wake Forest, North Carolina, told him that a dissatisfied neighlzir had telephoned them

about him clothesline. The Recks paid no attention to the warming and still dried their clothes on a line in the

yard. "Many people e say they are environmentally friendly but they don't take matters in their own hands,"

says Reck. The local HOA has decided not to take any action, unless more neighbors come to them.

     North Carolina lawmakers are saying that banning clotheslines is not the right thing to do. But HOAs and

housing businesses believe that clothesline drying reminds people of poor neighborhoods. They worry that if

buyers think their future neighbors can't even afford dryers, housing prices will fall.

     Environmentalists say such worries are not necessary, and in view of global warming, that idea needs to

change. As they say, "The clothesline is beautiful. Hanging clothes outside should be encouraged. We all have

to do at least something to slow down the process of global warming."

1. One of the reasons why supporters of clothes dryers are trying to ham clothesline drying is that _____.

A. clothes dryers are more efficient

B. clothesline drying reduces home value

C. clothes dryers are energy-saving

D. clothesline drying is not allowed in most U.S. states

2. Which of the following best describes Matt Reck?

A. He is a kind-hearted man.

B. He is an impolite man.

C. He is and experienced gardener.

D. He is a man of social responsibility.

3. Which of the following best describes Matt Reck?

A. He is a kind-hearted man.

B. He is an impolite man.

C. He is and experienced gardener.

D. He is a man of social responsibility.

4. What is mainly discussed in the text?

A. Clothesline drying: a way to save energy and money.

B. Clothesline drying: a lost art rediscovered.

C. Opposite opinions on clothesline drying.

D. Different varieties of clotheslines.

从所给的四个选项中，选择最适合的一个填入问号处，使之呈现一定的规律性（）

A．A

B．B

C．C

D．D

关于通气机湿化器，说法错误的是（）。

A.通气机湿化装置分为雾化器和潮化器两类

B.湿化器应安放在通气机输出气路的吸气管或呼气管中

C.雾化器以雾滴的方式增加气体的含水量，只加湿不加温

D.潮化器以水分子的方式增加气体的含水量，既加湿又加温

E.安放湿化器会增加气路的流阻