问题 解答题

八年级(1)班准备组织学生出去旅游,班长选择了一家旅行社去咨询费用,该家旅行社承诺组团旅行人数在50人以上(不包括50人),可享受优惠价,但组团人数在50人以下(包括50人),只能按原价付费.班长计算了一下,若按现在班级人数购票,只能按原价付费,需用900元;于是班长邀请了10位家长参与这次活动,那么就可以享受优惠价,只需880元.请解答下列问题:

(1)八年级(1)班的学生人数在什么范围内?

(2)若按优惠价10人的旅游费用与按原价8人的旅游费用相同,那么八年级(1)班共有多少名学生?

答案

(1)设八年级(1)班共有x名学生,则(1分)

x≤50
x+10>50
(4分)

解得40<x≤50(5分)

∴八年级(1)班的学生人数多于40人但不超过50人.(6分)

(2)根据题意得:

10×

880
x+10
=8×
900
x
(9分)

解得x=45(10分)

经检验知:x=45是所列方程的解并且符合题意,(11分)

∴八年级(1)班共有45名学生.(12分)

阅读理解

E

Water and its importance to human life are the center of the world’s attention. March 22 is World Water Day, which has the theme “Water and culture ”this year. Ther are more than one billion people in the world who live without safe drinking water. The United Nations hopes to cut this number in half by 2015.

Solving such a big problem seems like an unreal challenge. But everyone, even teenagers, can do something to help. A teenage girl in the U.S. has set an example to others of her age around the world. Rene Haggerty, 13, was awarded the 2004 Gloria Barron Prize for her work of collecting deserted batteries which pollute water.

In 2003, Haggerty went on a field trip to the Great Lakes Science Centre in Ohio. There, she saw an exhibit about how chemicals in old batteries harm the water of Lake Erie. Haggerty learnt that recycling the batteries was an easy solution. “I think everybody can do it, because everyone uses batteries, and it can make a big difference.”With these words, she began to increase awareness in her area.

She talked to her county government and school board. She got permission to start a recycling programme in schools as well as the public libraries, hospitals, and churches. With the help from her family, friends and local waste-management officials, she gathered containers, arranged transportation, and made an educational video.

Over the past two years, she collected four tons of batteries and drew the attention of officials, who were in charge of a battery recycling programme but had made little progress. When asked if she feels like a hero, Haggerty is quite modest. “Not really. Well, maybe for the fish I saved!”

Every year the Gloria Barron Prize honors young Americans aged 8 to 18 who have shown leadership and courage in serving the public and the planet. Each year ten winners receive $2,000 each, to help with their education costs or their public service work.

68.According to the passage, how many people probably can’t drink safe drinking water in 2015?

A.About I billion.                                            B.About 2 billion.

C.About 500 million.                                        D.About 5 million.

69.In order to collect used batteries, Rene Haggerty did the following things EXCEPT_______.

A.gather some containers                                  B.arrange the transportation

C.make an educational video                             D.go on a field trip

70.The best title for this passage should be_______ .

A.A girl awarded the 2004 Gloria Barron Prize

B.A girl acts to clean the world’s water

C.We should protect our environment

D.A girl collecting batteries

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