The costs are becoming even more evident, and I don't mean just the monthly bill.Dr.Chris Knippers, a counselor at the Betty Ford Center in Southern California, reports that the overuse of cell phones has become a social problem not much different from other harmful addictions: a barrier to one­on­one personal contact, and an escape from reality.

　　 Sounds extreme, but we've all witnessed the evidence: the person at a restaurant who talks on the phone through an entire meal, ignoring his kids around the table; the woman who talks on the phone in the car, ignoring her husband; the teen who texts messages all the way home from school, avoiding contact with kids all around him.

　　 Is it just rude, or is it a kind of unhealthiness? And pardon me, but how is this improving the quality of life?

　　 Jim Williams, an industrial sociologist based in Massachusetts, notes that cell­phone addiction is part of a set of symptoms in a widening gulf of personal separation.He points to a study by Duke University researchers that found one­quarter of Americans say they have no one to discuss their most important personal business with.Despite the growing use of phones, e­mail and instant messaging, in other words, Williams says studies show that we don't have as many friends as our parents. "Just as more information has led to less wisdom, more acquaintances via the Internet and cell phones have produced fewer friends，" he says.

　　 If the cell phone has truly had these effects, it's because it has become very widespread.Consider that in 1987, there were only 1 million cell phones in use.Today, something like 300 million Americans carry them.They far outnumber wired phones in the United States.

　　9．Which of the following best explains the title of the passage?

　　A．Cell phone users smoke less than they used to.

　　B．More people use cell phones than smoke cigarettes.

　　C．Cell phones have become as addictive as cigarettes.

　　D．Using cell phone is just as cool as smoking cigarettes.

　　10．The underlined word "curb" in Paragraph 2 means "________"．

　　A．control B．ignore

　　C．develop D．rescue

　　11．The example of a woman talking on the phone in the car supports the idea that ________.

　　A．women use cell phones more often than men

　　B．talking on the phone while driving is dangerous

　　C．cell phones make one­on­one personal contact easy

　　D．cell phones do not necessarily bring people together

　　课下能力提升(二十一)

　　1．解析：选B　细节理解题。由文章首句可知是黄石无与伦比的美丽使得美国政府决定建立黄石国家公园。

　　2．解析：选D　词义猜测题。根据上下文语义"唯恐狼群威胁到家畜，政府悬赏猎人去杀死狼，并以每头15美元的价格收购"可知选D项。

　　3．解析：选B　细节理解题。根据文章第四段第三句中"Afraid that the wolves would threaten their livestock"可知人们担心狼群对家畜的危害是杀死狼的原因，故B项正确。由第二段可以看出geyser是间歇喷泉，所以A项错误；由第六段最后一句人们一生难得在黄石公园见一次狼可知狼数量还相当少，所以要恢复至原来的数目还需要很久，故C项错误；最后一段说黄石公园位列世界第六大自然景观，故D项错误。

　　4．解析：选C　推理判断题。由第六段第二句可知黄石公园的狼群有70%的狼有No.9的基因，即No.9这只狼到黄石公园是比较早的。

语篇解读：本文属于科普类短文，主要介绍未来的社会可能会变成什么样子以及以前