问题 选择题

方程x(x-6)=0的解为(  )

A.x1=6

B.x1=0,x2=-6

C.x1=-6

D.x1=0,x2=6

答案

∵x(x-6)=0

∴x=0或x-6=0

∴x1=0,x2=6.

故选D

探究题

极地的环境问题

    极地环境保护问题是一个严重的问题,特别是北极地区,对北极环境的破坏归因于对自然资源的开采和加工。尤其是工业加工造成的严重的污染,由于臭氧层空洞的出现,南极冰层已经呈现缩小的趋势,这将对全球环境带来重大影响。因为海平面的升高将威胁人类人口40%~50%以上的各国主要沿海城市。另外由于冰体的消融改变了全球的生态平衡,一些动植物的生活环境被破坏,导致生物迁移和灭绝。由于冰川和冰盖的消融,许多几百年至几万前埋藏于冰盖中的微生物被暴露出来,这些微生物的扩散可能会影响到人类的健康。这都将对人类生存环境造成威胁。再加上人类的滥捕使极地动物受到严重的威胁。据2003午11月5日《中国环境报》报道,北冰洋浮冰正以每10年9%的速度减少。它不仅表明北极陆地气温正在迅速升高,同时还揭示北极地区的夏季海洋冰层区域正在慢慢缩小,全球气候正在迅速变化。

    各国间订立了相关条约来保护极地的环境。在南极,不论哪个国家的考察队员在任何现场都会将火柴棍、烟头带回到垃圾摆放处。特别是含有重金属的废旧电池,在放垃圾的时候都要单独放置。在极地几乎看不到人为遗弃的垃圾。但南极确实被污染了。比较来看,南极仍然是地球上受污染较少的地区,它们比北极受到的污染还少。但是世界各国必须从现在起就行动起来,严格限制自己的行为,以防南极污染进一步发展。同时人类应该更加重视人们生产、生活的其他各洲的环境治理和生态修复。

思考:

(1)极地地区冰雪的融化会带来哪些严重的影响?

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(2)作为地球大家园的主人,我们应该如何更好地保护我们生活的环境?

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阅读理解

Dear Cary,

I’m writing because I’ve understood you’ve struggled with alcoholism(酗酒).I’ve been fighting mine ever since I went through 9-11.After that,I’ve been more or less useless professionally –I’m a lawyer–and have had to resign from my job because I was discovered passed-out drunk in front of my computer. I’ve taken some medicine and it has helped somewhat. I can manage about a month without drinking,but after that I end up having a crazy stage where nothing matters except drinking.After a week or so of heavy drinking,I start having nightmares of people jumping. After that,it’s a week of not being able to get out of bed.

I was supposed to travel to a conference but didn’t make it because I got so drunk at the airport that I fell down on my face and spent the rest of the day in the emergency room. I have been hiding from my family since then.Fortunately they won’t be expecting me to come back for a week or so. Otherwise, they would notice the bump on my forehead and two black eyes.

I don’t really know what I’m asking you.Cary, I need a way out that doesn’t involve causing pain to my family.I’m taking medicine,but I still have these attacks every few months.If there’s alcohol in the house,I can’t stay away from it.It seems that this will never end. I’m afraid of what will happen if something bad happens,like a family member dying, or getting fired again.

Thanks for reading.

Yours T

小题1:The underlined sentence shows us all the following EXCEPT____________.

A.that the author is a lawyer by profession

B.that the author is a lawyer and he seldom gets drunk

C.the reason why the author had to resign

D.that the author was once discovered drunk as a fish小题2:The author writes to Cary in order to____________.

A.offer advice

B.tell a story

C.avoid nightmares

D.ask for help小题3:What is the author worried about?

A.Losing his job

B.Missing the conference

C.Bring pain to his family

D.Giving up drinking小题4:What do we learn from the passage?

A.T’s family members don’t want to see him because of his alcoholism.

B.Getting drunk once prevented T from attending a conference.

C.T will have nightmares when he stops drinking.

D.T never attempted to give up his alcoholism.小题5:We know from the passage that Cary____________.

A.likes to talk about the details of his life.

B.is an expert on treating alcoholism

C.is probably a recovered alcoholic

D.never suffered from alcoholism