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The world is not only hungry, but it is also thirsty for water．This may seem strange to you，since nearly 70 percent of the earth's surface is covered with water．But about 97 percent of this huge amount is sea water, or salt water．Man can only drink and use the other 3 percent-the fresh water from rivers，lakes，underground，and other sources．And we cannot even use all of that，because some of it is in the form of icebergs and glacier．Even worse，some of it has been polluted．
However，as things stand today, this small amount of fresh water is still enough for us．But our need for water is increasing rapidly-almost day by day．Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on．
We all have to learn how to stop wasting our valuable water．One of the first steps is to develop ways of reusing it．
Today in most large cities，water is used only once and then sent out into a sewer system．From there it returns to the sea or runs into underground storage tanks．But it is possible to pipe used water to a purifying plant．There it can be treated with chemicals so that it can be used again，just as if it were fresh from a spring．
But even if every large city purified and reused its water，we still would not have enough．All we'd have to do make use of the vast reserves of sea water in the world is to remove the salt．
If we take these steps we'll be in no danger of drying up．
56．The world is thirsty for water because we can only use percent of the water covering the surface of the earth．
A．3 B．more than 3 C．less than 3 D．97
57．Which of the following statements is NOT TRUE?
A．As things remain unchanging，this small amount of fresh water is still enough for us．
B．Our need for water is becoming larger and larger．
C．There will be no water shortage in the future．
D．We should take steps to deal with the water shortage problem．
58．To reuse water, we should ．
A．treat it with chemicals B．use it only once
C．send it out into a sewer system D．make it flow into underground tanks
59．In order to have enough water．we should also make use of ．
A．icebergs and glaciers B．sea water
C．rivers and lakes D．underground water
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The world is not only hungry, but it is also thirsty for water．This may seem strange to you，since nearly 70 percent of the earth's surface is covered with water．But about 97 percent of this huge amount is sea water, or salt water．Man can only drink and use the other 3 percent-the fresh water from rivers，lakes，underground，and other sources．And we cannot even use all of that，because some of it is in the form of icebergs and glacier．Even worse，some of it has been polluted．
However，as things stand today, this small amount of fresh water is still enough for us．But our need for water is increasing rapidly-almost day by day．Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on．
We all have to learn how to stop wasting our valuable water．One of the first steps is to develop ways of reusing it．
Today in most large cities，water is used only once and then sent out into a sewer system．From there it returns to the sea or runs into underground storage tanks．But it is possible to pipe used water to a purifying plant．There it can be treated with chemicals so that it can be used again，just as if it were fresh from a spring．
But even if every large city purified and reused its water，we still would not have enough．All we'd have to do make use of the vast reserves of sea water in the world is to remove the salt．
If we take these steps we'll be in no danger of drying up．
56．The world is thirsty for water because we can only use percent of the water covering the surface of the earth．
A．3 B．more than 3 C．less than 3 D．97
57．Which of the following statements is NOT TRUE?
A．As things remain unchanging，this small amount of fresh water is still enough for us．
B．Our need for water is becoming larger and larger．
C．There will be no water shortage in the future．
D．We should take steps to deal with the water shortage problem．
58．To reuse water, we should ．
A．treat it with chemicals B．use it only once
C．send it out into a sewer system D．make it flow into underground tanks
59．In order to have enough water．we should also make use of ．
A．icebergs and glaciers B．sea water
C．rivers and lakes D．underground water
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Yellowstone is the United States' first and most famous national park. This large wilderness area is very high in the Rocky Mountains of the northwestern US. It is bigger than the smallest state in the US.
Yellowstone became the world's first national park in 1872.
Yellowstone has many different kinds of unusual scenery：Although millions of people visit the park, the land remains unchanged－still a wilderness. The valley of the Yellowstone River has beautiful coloured rocks and three large waterfalls. In the early morning or evening, visitors sometimes see large deer－like animals, or buffalo(水牛)eating grass along the shores of Lake Yellowstone. The high mountains around Yellowstone are covered with evergreen forests.
Yellowstone Park has many areas with hot springs. These are caused by heat from the hot centre of the earth. Old Faithful is the most famous. Every 70 minutes, old Faithful sends hot water about 150 feet high into the air.
Here, hot spring water runs down over rocks into deep pools. It looks rather like a wonderful white cake.
When you visit Yellowstone, why not live like a cowboy? You can stay at an Old West country hotel. You'll enjoy typical cowboy food outdoors. You can ride a horse along one of the many paths or tralils.
There are over 1,000 miles of trails around Yellowstone. If you like excitement, take a boat trip down the fast Snake River, or spend a quiet summer day fishing by a river or a blue mountain lake.
In winter, Yellowstone Park is covered with heavy snow, but visitors still come to skate. With clouds of steam above them and snow all around, Yellowstone's hot springs look even more wonderful.
1．Which of the following is not true?
[ ]
A．Yellowstone Park has the longest history in US.
B．Yellowstone has a beautiful scenery.
C．There are forests in the park.
D．There are all kinds of birds in the park.
2．Visitors in the park can see animals eating grass ________.
[ ]
A．wherever they go
B．whenever they go
C．from time to time
D．on the top of the mountains
3．In this passage, the writer advises us to ________.
[ ]
A．become a cowboy
B．spend nights outdoors
C．do something as a cowboy did
D．drive along the paths
4．One of the most exciting activities in the park in summer is ________.
[ ]
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Yellowstone Park(黄石公园)Yellowstone is the United States' first and most famous national park. This large wilderness area is very high in the Rocky Mountains(落基山脉) of the northwestern US. It is bigger than the 1 (biggest, smallest) state in the US. Yellowstone became the world's first national park in 1872. Yellowstone has many different kinds of unusual scenery. Although millions of people visit the park, the land remains 2 (unchanged, unchanging)-still a wilderness. The valley of the Yellowstone River has beautifully coloured rocks and three large waterfalls. 3 (In, On) the early morning or evening, visitors sometimes see large deer-like animals, or buffalo(水牛) 4 (eat, eating) grass along the shores of Lake Yellowstone. The high mountains around Yellowstone are covered 5 (with, by) evergreen forests. Yellowstone Park has many areas 6 (with, of) hot springs(泉). These are caused by heat 7 (from, in) the hot centre of the earth. Old Faithful(老忠诚) is the most famous. 8 (Every, Each) 70 minutes, Old Faithful sends hot water about 150 feet high 9 (into, in) the air. Here, hot spring water runs down over rocks 10 (onto, into) deep pools. It looks 11 (rather, fairly) like a wonderful white cake. When you visit Yellowstone, why 12 (not live, not to live) like a cowboy? You can stay 13 (at, in) an Old West country hotel. You'll enjoy typical cowboy food outdoor. You can ride a horse along one of the many paths or trails. There are over 1,000 miles of trails around Yellowstone. If you like excitement, take a boat trip down the fast Snake River. Or spend a 14 (quiet, quite) summer day 15 (fishing, to fish) by a river or a blue mountain lake. In winter, Yellowstone Park is covered with heavy snow, but visitors still come to skate, with clouds of steam above them and snow around Yellowstone's hot springs look even more wonderful.
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