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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. But now it has a serious problem.    小題1:   In most of the past 35 years, it didn't reach the sea.
The Nile in Egypt, running 6, 650 km, is the longest river in the world. 小題2:Now it is down to 2 billion m' or so. Australia's Murray River reaches the sea only every other year. One fifth of America's Rio Grande has no water, either.
____小題3:
Mostly it's damming (筑壩) and global warming that make rivers dry.
____小題4:   Now about 45, 000 of them lie across the world's rivers. They hold back around 15% of the world's fres

h water from running to the sea.
Global warming is making things worse. Warmer weather takes water away. The glacier (冰川) are becoming smaller. 小題5: Global warming has had certain effects on water sources (源頭). Droughts (干旱) happening around the world make people pay more attention to this fact.

A．Dams hold water to irrigate (灌溉) fields and make power.

B．The source of the Yellow River is drying up because of it.

C．It used to carry 32 billion m' of water a year.

D．How does it happen?

E. Factories pour waste water into rivers directly.
F. Its source on Qinghai-Tibet Plateau is drying up.

小題1:F
小題1:C
小題1:D
小題1:A
小題1:B

從方框中所給的選項中選出能填入空白處的最佳選項，補全短文，其中有一項為多余選項。（10分）
文章大意：每年的3月20日是世界水日。根據美國的一個報道，世界上有一半多的主要河流嚴重缺水或被污染。黃河，世界上第五大河，在過去的35年里，就沒有流到大海里。同意，埃及的尼羅河，世界上最長的河流，由原來每年的32000000000平方米的流量降低到2000000000.等等。是說明原因造成這樣的現象？主要是由于筑壩和全球變暖導致河流干涸。

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