B
As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without any living things.
Pollution in water is not simply a matter of “poisons” killing large numbers of fish overnight, Very often the effects of pollution are not noticed for many months or years because the first organisms（生物体）to be affected are either plants or plankton(浮游生物). But these organisms are the food of fish and birds and other creatures. When this food disappears, the fish and birds die too. In this way a whole food chain can be wiped out, and it’s not until dead fish and water birds are seen at the river’s edge or on the seashore that people realize what is happening.
　　Where do the substances which pollute the water come from? There are two main sources of sewage（下水道污物）and industrial waste. As more detergent（洗涤剂）is used in the home, so more of it is finally put into our rivers, lakes and seas. Detergents harm water birds, dissolving the natural substances which keep their feathers water-proof (防水). Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful as there are many highly poisonous things in it, such as copper and lead.
　　So, if we want to stop this pollution, the answer is simple: sewage and industrial waste must be made clear before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.
70. Pollution of water is noticed________.
　　A. when the first organisms are affected　     
B. when a good many fish and birds die
　　C. when poisonous things are poured into water　
D. as soon as the balance of nature is destroyed
71.The living things die because there is no ________in the lake or river.
　　A. water　　　　　            B. fish           　 C. poison　　　　　  D. oxygen
72. Which of the following is harmful according to the passage?
　　A. Organisms              　B. Plants and plankton in the water
　　C. Waste water from cleaning    D. Industrial waste made clear before flowing into the water
73. The way to stop water pollution is to________.
　　A. realize the serious situation clearly
　　B. put oxygen into the river
　　C. make the waste material harmless before flowing into the water
　　D. make special room in the sea for our rubbish

　
E　　
As a result of pollution , Lake Erie , on the borders of the USA and Canada, is now without any living things.　　
Pollution in water is not simply a matter of “poisons” killing large numbers of fish overnight. Very often the effects of pollution are not noticed for many months or years because the first organism(生物体 ) to be affected are either plants or plankton. But these organisms are the food of fish and birds and other creatures. When this food disappears, the fish and birds die too. In this way a whole food chain can be wiped out, and it is not until dead fish and water birds are seen at the river’s edge or on the sea shore that people realize what is happening.　　
Where do the substances which pollute the water come form? There are two main sources sewage (污水) and industrial waste. As more detergent (洗涤剂 ) is used in the home, so more of it is finally put into our rivers. lakes and seas. Detergents harm water birds dissolving the natural substances which keep their feathers waterproof. Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful since there are many highly poisonous things in it, such as copper and lead(铅 ).　　
So , if we want or stop this pollution , the answer is simple: sewage and industrial waste must be made clean before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.　　
72. Pollution in water is noticed _____. 　　
A. when the first organisms are affected    B. when a good many fish and birds die 　　
C. when poisonous things are poured into water      　　
D. as soon as the balance of nature is destroyed 　　
73. The living things die because there is no ____ in the lake or river.  　　
A. water          B. fish               C. poison           D. oxygen 　　
74. Which of the following is harmful according to the passage? 　　
A. Organisms                             B. Plants and plankton in the water     　　
C. Waste water from cleaning   D. Industrial waste made clear before flowing into the water 　　
75.The way to stop water pollution is _______.　　
A. realize the serious situation clearly 　　
B. put oxygen into the river 　　
C. make the waste material harmless before flowing into the water 　　
D. make special room in the sea for our rubbish　　

The easy way out isn’t always easiest. I learned that lesson when I decided to treat Doug, my husband of one month, to a special meal. I glanced through my cookbook and chose a menu which included homemade bread. Knowing the bread would take time, I started on it as soon as Doug left for work. As I was not experienced in cooking, I thought if a dozen was good, two dozen would be better, so I doubled everything. As Doug loved oranges, I also opened a can of orange and poured it all into the bowl. Soon there was a sticky dough (面团) covered with ugly yellowish marks. Realizing I had been defeated, I put the dough in the rubbish bin outside so I wouldn't have to face Doug laughing at my work, I went on preparing the rest of the meal, and, when Doug got home, we sat down to Cornish chicken with rice. He tried to enjoy the meal but seemed disturbed. Twice he got up and went outside, saying he thought he heard a noise. The third time he left, I went to the windows to see what he was doing. Looking out, I saw Doug standing about three feet from the rubbish bin, holding the lid up with a stick and looking into the container. When I came out of the house, he dropped the stick and explained that there was something alive in our rubbish bin. Picking up the stick again, he held the lid up enough for me to see. I felt cold. But I stepped closer and looked harder. Without doubt it was my work. The hot sun had caused the dough to double in size and the fermenting yeast (酵母) made the surface shake and sigh as though it were breathing. I had to admit what the ‘living thing’ was and why it was there. I don’t know who was more embarrassed by the whole thing, Doug or me.　　

The writer’s purpose in writing this story is ________.

　　A. to tell an interesting experience

　　B. to show the easiest way out of a difficulty

　　C. to describe the trouble facing a newly married woman

　　D. to explain the difficulty of learning to cook from books

Why did the woman’s attempt at making the bread turn out to be unsuccessful?

　　A. The canned orange had gone bad.

　　B. She didn’t use the right kind of flour.

　　C. The cookbook was hard to understand.

　　D. She did not follow the directions closely.

Why did the woman put the dough in the rubbish bin?

　　A. She didn’t see the use of keeping it

　　B. She meant to joke with her husband.

　　C. She didn’t want her husband to see it.

　　D. She hoped it would soon dry in the sun.

What made the dough in the rubbish bin look frightening?

　　A. The rising and falling movement.

　　B. The strange-looking marks.

　　C. Its shape.

　　D. Its size.

When Doug went out the third time, the woman looked out of the window because she was  ________.

　　A. surprised at his being interested in the bin

　　B. afraid that he would discover her secret

　　C. unhappy that he didn't enjoy the meal

　　D. curious to know what disturbed him

　　The easy way out isn't always easiest. I learned that lesson when I decided to treat Doug, my husband of one month, to a special meal. I glanced through my cookbook and chose a menu which included homemade bread. Knowing the bread would take time, I started on it as soon as Doug left for work. As I was not experienced in cooking, I thought if a dozen was good, two dozen would be better, so I doubled everything. As Dong loved oranges, I also opened a can of orange and poured it all into the bowl. Soon there was a sticky dough（面团）covered with ugly yellowish marks. realizing I had been defeated, I put the dough in the rubbish bin outside so I wouldn't have to face Doug laughing at my work, I went on preparing the rest of the meal, and, when Doug got home, we sat down to Cornish chicken with rice. He tried to enjoy the meal but seemed disturbed. Twice he got up and went outside, saying he thought he heard a noise. The third time he left, I went to the windows to see what he was doing. Looking out, I saw Doug standing about three feet from the rubbish bin, holding the lid up with a stick and looking into the container. When I came out of the house, he dropped the stick and explained that there was something alive in out rubbish bin. Picking up the stick again, he held the lid up enough for me to see. I felt cold. But I stepped closer and looked harder. Without doubt it was my work. The hot sun had caused the dough to double in size and the fermenting yeast （酵母）made the surface shake and sigh as though it were breathing. I had to admit what the 'living thing 'was and why it was there. I don't know who was more embarrassed（尴尬）by the whole thing ,Doug or me?
44．The writer's purpose in writing this story is ___________
　　A．to tell an interesting experience
　　B．to show the easiest way out of a difficulty
　　C．to describe the trouble facing a newly married woman
　　D．to explain the difficulty of learning to cook from books
45．Why did the woman's attempt at making the bread turn out to be unsuccessful?
　　A．The canned orange had gone bad.
　　B．She didn't use the right kind of flour.
　　C．The cookbook was hard to understand.
　　D．She did not follow the directions closely.
46．Why did the woman put the dough in the rubbish bin?
　　A．She didn't see the use of keeping it
　　B．She meant to joke with her husband.
　　C．She didn't want her husband to see it .
　　D．She hoped it would soon dry in the sun.
47．What made the dough in the rubbish bin make the noise?
　　A．The rising and falling movement.
　　B．The strange-looking marks.
C．Its shape.                 
D．Its size.
48．When Doug went out the third time, the woman looked out of the window because she was ______________.
　　A．surprised at his being interested in the bin
　　B．afraid that he would discover her secret
　　C．unhappy that he didn't enjoy the meal
　　D．curious to know what disturbed him