1、　　Many people use wood stoves and fireplaces to heat their homes.Scientists have become worried about the smoke that they give off.Harmful chemicals are in the smoke.The smoke is causing air pollution.The pieces of pollution, called soot, are floating in the air.They are too tiny to see.Scientists must use a microscope to see them.

　　Small amounts of soot are safe, but large amounts can be dangerous.The govenment wants to limit this kind of pollution.It may stop people from using their fireplaces.

　　The air is tested every day.When soot levels are high, more than 65 micrograms of soot per cubic meter, factories must stop making smoke.The government thinks that limit should be much lower.

　　Factories produce the most smoke and soot.But the government thinks that all types of burning should be limited.The soot levels from factories and homes could be limited.Home owners may have to install new wood stoves that they comply with the new law.Or, they may not be able to bum on days when the air quality is bad.

　　Residents of some towns are fined if they violate the burning ban.Scientists hope these new regulations will make the air cleaner and less harmful to breathe.

　　[单选题]Why is it dangerous to burn too much wood?

　　A.The fire could burn yo

　　B.It's not healthy to be too war

　　C.Harmful chemicals are released in the so

　　D.The smoke is filled with see able tiny piece

　　[答案]C

　　[解析]第一段。燃烧木材，排放出烟。烟中存有肉眼看不见的颗粒。这些颗粒是有害的化学物质。燃烧越多的木材，产生的烟就越多，释放的有害化学物质的颗粒也就越多。所以，燃烧过多的木材是危险的。

　　[单选题]What could home owners do to comply with the new regulation?

　　A.Write a letter

　　B.Ask for permission

　　C.Use more electricity

　　D.Install new low-soot fireplaces

　　[答案]D

　　[解析]第二、三、四段。政府认为应当限制煤烟的排放量，以减少空气中的污染颗粒。工厂是排放煤烟最多的地方，应当加以限制。但政府认为，住宅也应受此限制，减少煤烟的排放。新的法律规定住宅必须安装新型的低烟壁炉，否则，在污染比较严重的时期，这些住户是不能使用他们的壁炉的。

　　[单选题]What happens to some residents who bum too much wood?

　　A.They could lose their homes

　　B.They pay for the punishment

　　C.They get sick from the smoke

　　D.The fire could get out of control

　　[答案]B

　　[解析]见第五段。在有些城镇，如果居民违反燃烧法规是会受到罚款的。

　　[单选题]Why is the air quality tested every day?

　　A.Just in case someone ask

　　B.Scientists like to take test

　　C.Scientists are not very bus

　　D.To keep track of pollution level

　　[答案]D

　　[解析]见第三、四段。科学家每天检测，空气中这种有害颗粒的密度。如果密度高于65毫克/立方米(科学家认为这个标准还应下调)，工厂应停止排烟，住宅应停止燃烧壁炉，如果住宅没有安装新型低烟壁炉的话。

　　2、

　　At the first sight the planet Mars does not appear very welcome to any kind of life.It has very little oxygen and water, the temperature at night is below -50~Cand winds of 100 miles per hour cause severe dust storms.However, the surface of the planet seems to show that water flowed across it some time in the past, and it is believed that there is enough ice at the poles to cover the planet with water if it melts.Although there is no life on the Mars now, some scientists think that there may have been some form of life long time ago.At that time, the planet had active volcanoes; the atmosphere was thicker and warmer; and there was water.In fact, in some ways the Mars may have been similar to the Earth, where life exists.

　　Some people believe that the Mars could support life in the future if the right conditions were produced.The first step would be to warm the planet using certain gases which trap the Sun's heat in the planet's atmosphere.With warmth, water and carbon dioxide (二氧化碳), simple plants could begin to grow.These plants could slowly make the Mars more suitable for living.It is estimated that the whole process might take between 100,000 and 200,000 years.In the meantime, people could begin to live on the planet in special closed environments.They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.

　　[单选题]Some scientists think there may have been life on the Mars in the past because __.

　　A.there is no life there now

　　B.there is a large amount of water at the poles

　　C.the Mars may be able to support life in the future

　　D.conditions may have been similar to those on the Earth

　　[答案]D

　　[解析]第一段大意是：人们最初对火星的印象是火星上不可能有生命。因为几乎没有氧气和水，并且夜间温度低于-50°C，同时还有每小时100英里的风速引起的严重的沙尘暴。然而星球的表面却告诉我们，过去的某个时段水曾经从这里流过。人们相信极地有足够的冰，一旦融化便可覆盖整个星球。虽然现在火星上没有生命，但在过去很久很久以前，生命很有可能存在过。由此可看出，生命所需的条件——水和氧——在火星上和在地球上是相似的。所以选项D正确。而选项B说火星上有水是不对的。火星的极地有冰，只有当冰融化后才能使整个星球有水。

　　[单选题]There could be life on the Mars in the future if

　　A.it supported life in the past

　　B.certain gases are used to cool the planet

　　C.the atmosphere can be heated enough to grow simple plants

　　D.the planet's volcanoes become as active as they were in the past

　　[答案]C

　　[解析]第二段大意是：如果要想改变火星的条件使之适合居住，首先要提高星球的温度，其方法是用某些气体收集太阳的热能。有了温度、水和二氧化碳，一些植物便可生长。慢慢地使星球适合生存。选项C，“人们可以以提高环境的温度的方式来使一些植物生长”是正确的。

　　[单选题]The author's attitude towards the possibility of life on the Mars in the future is __.

　　A.doubtful

　　B.positive

　　C.negative

　　D.uninterested

　　[答案]B

　　[解析]根据全文可以判断，作者对人类在火星上生存的可能性抱着积极、乐观的态度。

　　[单选题]Which is the best title for this passage?

　　A.The Possibility of Life on the Mars

　　B.Future Conditions on the Mars

　　C.The Mars and the Earth

　　D.A Study of the Climate of the Mars

　　[答案]A

　　[解析]文章的标题就是文章的中心。作者从火星上曾经有过生命的证明谈到未来通过提高温度而使火星适合生存的设想，表明文章的中心是：火星具有生命存在可能性。

　　3、

　　Laura was married for 6 months.Her husband was using drugs.She didn't want her son or her unborn baby to live that way, but she was afraid to ask her husband to leave.She left him a note instead.After reading the note, Laura's husband waited for her to come home and then beat her and her son.

　　Laura had little education and she never had a good paying job.She was ashamed to ask for help from the police, courts or women's shelters.Sometimes her husband was very nice to her.She decided to try harder so her children could have a home and a father.Laura joined a church and told a priest about her problem.

　　But her husband kept using drugs and hurting the family.Finally, she told her husband she loved him, but they should live apart for a while.He beat her again.The priest came over to talk to her.He asked the husband to go out for a while.Laura packed up her things and left home with her son.The next day she lost the baby.Her husband went to jail.

　　Laura got a lot of help from groups that help women who have been beaten.Now she is in college, has her own apartment and works on special projects at a women's shelter."We got out, and it changed life for me and my child.You can do it.You can break the cycle," Laura said.

　　[单选题]The message Laura left her husband was most likely “__ ”.

　　A.Do not beat the kid any more

　　B.Learn to take care of the family

　　C.Leave me and my children

　　D.Be a good father

　　[答案]C

　　[解析]见这篇短文涉及家庭暴力的问题。第一段讲到Laura结婚六个月了。她丈夫吸毒。她不希望自己的儿子或者未出世的孩子过这样生活。她很害怕她的丈夫，不敢直接撵她的丈夫出门，只好给她的丈夫留了一张字条。由此判断，字条上写的是要求她的丈夫离开这个家。

　　[单选题]Which of the following statements is TRUE?

　　A.Laura has two children

　　B.Laura never got any joy

　　C.Laura's husband got punished

　　D.Laura got little help from the society

　　[答案]C

　　[解析]第三段提到她在遭到丈夫的殴打之后失去了还未出生的孩子。因此她只有一个孩子。选项A错误。第二段提及她没有得到过高工资的工作，并不意味着她没有工作。选项B错误。第三段提到她失去孩子之后，她的丈夫进了监狱。因此，选项C正确。最后一段提到她得到了社会上的很多帮助，还进了大学。所以，选项D错误。

　　[单选题]Laura didn't go to the police or courts because __.

　　A.she was afraid of being laughed at

　　B.the priest asked her not to do so

　　C.her husband was a nice guy

　　D.she was not well-educated

　　[答案]A

　　[解析]从第二段可知，她没有受过什么教育，也从来没有过像样的工作。她的思想还是比较封闭的。因此她认为向警察、法院以及妇女避难所寻求帮助是件羞耻的事。

　　[单选题]Which of the following would be the best title for the passage?

　　A.Husband-Wife Relationship

　　B.Women's Rights

　　C.Laura's Marriage

　　D.Family Violence

　　[答案]D

　　[解析]整篇文章讲的是丈夫吸毒并对妻子、孩子使用暴力。因此，“家庭暴力”应是最合适的标题。

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