问题 解答题

某校要从艺术节活动中所产生的4名书法比赛一等奖的同学和2名绘画比赛一等奖的同学中选出2名志愿者,参加广州亚运会的服务工作.求:

(1)选出的2名志愿者都是获得书法比赛一等奖的同学的概率;

(2)选出的2名志愿者中1名是获得书法比赛一等奖,另1名是获得绘画比赛一等奖的同学的概率.

答案

把4名获书法比赛一等奖的同学编号为1,2,3,4.2名获绘画比赛一等奖的同学编号为5,6.

从6名同学中任选2名的所有可能结果如下:(1,2),(1,3),(1,4),(1,5),(1,6),(2,3),(2,4),(2,5),(2,6),(3,4),(3,5),(3,6),(4,5),(4,6),(5,6),共15个.(3分)

(1)从6名同学中任选2名,都是书法比赛一等奖的所有可能是(1,2),(1,3),(1,4),(2,3),(2,4),(3,4),共6个.

所以选出的2名志愿者都是书法比赛一等奖的概率P1=

6
15
=
2
5
(8分)

(2)从6名同学中任选2名,1名是书法比赛一等奖,另1名是绘画比赛一等奖的所有可能是(1,5),(1,6),(2,5),(2,6),(3,5),(3,6),(4,5),(4,6)共8个.

所以选出的2名志愿者1名是书法比赛一等奖,另1名是绘画比赛一等奖的概率是P2=

8
15
.(13分)

阅读理解

Digital Trend: BOOKLESS LIBRARIES

What if you could fit all of a library’s collection in the palm of your hand? That’s part of the idea behind an upcoming bookless public library in San Antonio. Called Biblio Tech, the system will lend out e-readers loaded with 10,000 titles for two-to-three –week periods. But don't bother holding on to the device longer than that because it’s programmed to go dead.

Other libraries have tried similar programs: In 2002, the Santa Rosa Branch Library in Tucson, Arizona, launched a digital-only facility, and a bookless project was proposed last year in Newport Beach, California. Those digital-only projects folded—residents wanted their paperbacks—but Stanford University maintains a successful bookless engineering library with over 65,000 titles. Officials say digital libraries are a low-cost way to educate the masses and argue their rise is inevitable.

Still, some insist print isn’t doomed. A recent Wall Street Journal article notes that e-book purchases skew(倾斜)heavily toward the sort of  “light entertainment” novels you can pick up at the grocery store. A survey from the Pew Research Center shows that about 90 percent of digital readers still crack open physical books.( After all, there are only four Twilight books. How hard is it to drag those around?)

小题1:From the first paragraph, we can tell _____.

A.you can always keep all of the books in your hands,

B.Biblio Tech will lend readers 10,000 books temporarily.

C.the books will not be stored in your device forever.

D.the bookless public library can be found in San Antonio now.小题2:The following statements are true except that _____.

A.the Santa Rosa Branch Library lend out e-readers with 10,000 books.

B.the physical books are still popular despite those bookless projects.

C.Stanford University sets a successful example of bookless engineering.

D.some officials agree that digital libraries are educative and unavoidable.小题3:What is the meaning of the underlined word in paragraph 2?

A.succeeded

B.opened

C.accepted

D.failed小题4:Some people insist that print will not disappear because _____.

A.e-books are mainly sort of “light entertainment” novels.

B.most of the digital readers prefer books about physics.

C.a majority of e-reader users still choose to read paperbacks.

D.it is easy to take 4 Twilight books everywhere.

单项选择题