完形填空（共20小题；每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从各题所给的四个选项中，选出最佳选项 。
Water and its importance to human life were the centre of the world’s attention last week. March 22 was World Water Day and
36 the theme “Water for Life”.
There are more than one billion people in the world who live without
37 drinking water. The United Nations
38 to cut this number in half by 2015.
Solving such a big problem seems like a(n)
39 challenge. But everyone,
40 teenagers, can do something to help. A teenage girl in the US has set an example to the
41 of her age around the world.
Rene Haggerty, 13, was awarded the 2004 Gloria Barron Prize for her work—
42 discarded(废弃的) batteries（电池）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
43 in old batteries harm the water of Lake Erie.Haggerty learnt that
44 the batteries was an easy solution. “I think everybody can do it, because everyone
45 batteries, and it can make a big difference.” With these words, she began to
46 awareness in her area.
She
47 her county government and school board. She got permission to start a recycling programme in schools
48 the public library, hospital, and churches. With help from her family, friends and local waste-management
49 , she gathered containers, arranged transportation, and made a(n)
50 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
51 progress.
When asked
52 she feels like a hero, Haggerty is quite ____
53 . “Not really. Well, maybe for the fish I saved!”
Every year the Gloria Barron Prize
54 young Americans aged 8 to 18 who have shown leadership and courage in
55 the public and the planet. Each year ten winners receive US $ 2,000 each, to help with their education costs or their public service work.
| 小题1: | | A．had | B．gave | C．wrote | D．discussed |
|
| 小题2: | | A．enough | B．safe | C．much | D．polluted |
|
| 小题3: | | A．asks | B．orders | C．hopes | D．ensures |
|
| 小题4: | | A．good | B．strong | C．important | D．unreal |
|
| 小题5: | | A．especially | B．sometimes | C．even | D．seldom |
|
| 小题6: | | A．boys | B．others | C．students | D．grown-ups |
|
| 小题7: | | A．collecting | B．selling | C．buying | D．using |
|
| 小题8: | | A．things | B．chemicals | C．water | D．air |
|
| 小题9: | | A．making | B．recycling | C．reducing | D．handling |
|
| 小题10: | | A．uses | B．has | C．throws | D．needs |
|
| 小题11: | | A．tell | B．increase | C．spread | D．inform |
|
| 小题12: | | A．talked to | B．listened to | C．heard from | D．thought about |
|
| 小题13: | | A．and | B．beside | C．as well as | D．as good as |
|
| 小题14: | | A．officials | B．workers | C．clerks | D．experts |
|
| 小题15: | | A．industrial | B．agricultural | C．scientific | D．educational |
|
| 小题18: | | A．proud | B．glad | C．modest | D．worried |
|
| 小题19: | | A．praises | B．helps | C．supports | D．honors |
|
| 小题20: | | A．awarding | B．saving | C．serving | D．favoring |
|
---温度
的坐标系中，一定质量的某种理想气体先后发生以下两种状态变化过程：第一种变化是从状态A到状态B，外界对该气体做功为
；第二种变化是从状态A到状态C，该气体从外
界吸收热量为
。图线AC反向延长线通过坐标原点O，B、C两状态的温度相同，理想气体的分子势能为零。求：
和其内能的增量
；
及其从外界吸收的热量
。