3．March 20th is World Water Day every year．According to a report from the United Nations，more than half of the world's major rivers have serious water loss and are polluted．
The Yellow River，the world's fifth longest river，watered some of the oldest farms on earth．（46）D Its source（源头）on Qinghai-Tibet Plateau is drying up．In most of the past 35years，it didn't reach the sea．
The Nile in Egypt，running 6，650km，is the longest river in the world．（47）C Now it is down to 2billion m3or so．Australia's Murray River reaches the sea only every other year．One fifth of America's Rio Grande has no water，either．
（48）B
Mostly it's damming（筑坝）and global warming that make rivers dry．（49）A Now about 45，000of them lie across the world's rivers．They hold back around 15% of the world's fresh water from running to the sea．
（50）E Warmer weather takes water away．The glacier（冰川）are becoming smaller．The source of the Yellow River is drying up because of it．Global warming has had certain effects on water sources．Droughts （干旱） happening around the world make people pay more attention to this fact．
The Yellow River，the world's fifth longest river，watered some of the oldest farms on earth．（46）D Its source（源头）on Qinghai-Tibet Plateau is drying up．In most of the past 35years，it didn't reach the sea．
The Nile in Egypt，running 6，650km，is the longest river in the world．（47）C Now it is down to 2billion m3or so．Australia's Murray River reaches the sea only every other year．One fifth of America's Rio Grande has no water，either．
（48）B
Mostly it's damming（筑坝）and global warming that make rivers dry．（49）A Now about 45，000of them lie across the world's rivers．They hold back around 15% of the world's fresh water from running to the sea．
（50）E Warmer weather takes water away．The glacier（冰川）are becoming smaller．The source of the Yellow River is drying up because of it．Global warming has had certain effects on water sources．Droughts （干旱） happening around the world make people pay more attention to this fact．
| A．Dams provide fields with water and make power． |
| B．How does it happen？ |
| C．It used to carry 32billion m3of water a year． |
| D．But now it has a serious problem． |
| E．Global warming is making things worse． |
1．I had never noticed her．She was not the kind of girl who could draw attention．She was not tall（1）Dlooked ordinary．In class，she liked sitting at the back，reading or writing notes．One day I asked her（2）Caloud the text．When I heard her standard （标准）American English，I looked at her with new eyes．And I remembered her name-Kelly．Later on，the National College Speech Competition would be held．One student in our school（3）Cto attend．I thought it over and filled in her name．Kelly practised（4）Afor the competition．However，I was a little worried （5）B she was always too quiet．Could she really（6）C well in the competition？
（7）D the night of the competition，I sat in the front row of the hall very early．I told her to take it easy．Her face turned red and she said nothing．（8）D seemed that she was really nervous．I felt upset，but I just patted her on（9）D shoulder and let her go to draw lots （抽签）．As a result，she drew No.9while No.8was a boy who was very good at giving speeches．
Sure enough，No.8was very（10）B．The whole audience made a warm applause．
While they（11）D about his speech with excitement，Kelly appeared on the stage．I with no courage to look at her．It was her（12）C time to go up the stage，so I couldn't be angry with her for any small mistakes．But at that moment，I found （13）B I was so afraid of her failure（失败）．
The strong spotlight and large hall made（14）B so small that nobody seemed to notice she had been on the stage．I felt hopeless．
But the moment that surprised me came．I clearly heard a voice，a very loud voice，"Now，please focus on me．"
Three times in all，louder and louder．
The whole audience fell silent．
I could hardly believe that loud voice came from the girl，who was usually soft-voiced and didn't catch attention at all．She gave a perfect speech．
I think I will never forget this touching lesson（15）A my student taught me-never underestimate（低估）the power of the silent people．
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（7）D the night of the competition，I sat in the front row of the hall very early．I told her to take it easy．Her face turned red and she said nothing．（8）D seemed that she was really nervous．I felt upset，but I just patted her on（9）D shoulder and let her go to draw lots （抽签）．As a result，she drew No.9while No.8was a boy who was very good at giving speeches．
Sure enough，No.8was very（10）B．The whole audience made a warm applause．
While they（11）D about his speech with excitement，Kelly appeared on the stage．I with no courage to look at her．It was her（12）C time to go up the stage，so I couldn't be angry with her for any small mistakes．But at that moment，I found （13）B I was so afraid of her failure（失败）．
The strong spotlight and large hall made（14）B so small that nobody seemed to notice she had been on the stage．I felt hopeless．
But the moment that surprised me came．I clearly heard a voice，a very loud voice，"Now，please focus on me．"
Three times in all，louder and louder．
The whole audience fell silent．
I could hardly believe that loud voice came from the girl，who was usually soft-voiced and didn't catch attention at all．She gave a perfect speech．
I think I will never forget this touching lesson（15）A my student taught me-never underestimate（低估）the power of the silent people．
| 1．A．or | B．but | C．as well | D．and |
| 2．A．read | B．reading | C．to read | D．to reading |
| 3．A．allow | B．allowed | C．was allowe | D．allows |
| 4．A．hard | B．hardly | C．harder | D．hardest |
| 5．A．though | B．because | C．when | D．if |
| 6．A．did | B．be done | C．do | D．doing |
| 7．A．In | B．At | C．By | D．on |
| 8．A．That | B．This | C．It's | D．It |
| 9．A．an | B．a | C．不填 | D．the |
| 10．A．success | B．successful | C．succeed | D．successfully |
| 11．A．talked | B．would talk | C．as well | D．were talking |
| 12．A．one | B．the one | C．first | D．the first |
| 13．A．when | B．that | C．why | D．what |
| 14．A．she | B．her | C．herself | D．hers |
| 15．A．which | B．whose | C．what | D．who． |