摘要:The salmon (**) is one of our most valuable fish. It gives us food and money. Every year, commercial fishing results in a harvest of over a billion pounds of salmon from the sea. Hundreds of thousands of salmon are caught each year by eager sports fishers. In autumn, the rivers of the northwestern United States come alive with salmon. They have left the ocean on their yearly run upriver to produce eggs. Yet today, there are far fewer salmon in the Northwest and elsewhere than ever before. That is because the salmon population suffers from many dangers of the modern age. Water pollution has killed many salmon by taking away the oxygen. Over-fishing has further reduced their numbers. Dams are another danger because they block the ways that the salmon move from one place to another. “Fish ladders , almost like stairs, have been built so that salmon can swim safely over the dams. But young salmon swimming to the ocean have trouble finding the ladders. They often fall to their deaths over the dam or are killed in giant hydroelectric . To fill the salmon supply, people have turned to fish farming, or aquaculture . Farm-raised salmon are Atlantic salmon. Most of them are raised in the United States, Canada, Scotland, and Norway. In a typical salmon farm, the fish remain in the places where they produce eggs until they are eight inches in length. Then they are moved to large net cages by the coast. There they are fed a diet of fish meal until they reach the size of eight pounds after about 18 months. Aquaculture is one of the world’s fastest growing food industries. It is replacing commercial fishing in many places and is reducing the price of salmon to about a third of its earlier price. The other benefit of aquaculture is that it is allowing the wild salmon population to recover. About a quarter of a million more salmon returned to their home rivers to produce eggs each year in the mid-1990s.1. Which following can reduce the number of the salmon except ? A. water pollution B. over-fishing C. building dams D. fish farming

网址:http://m.1010jiajiao.com/timu3_id_3123945[举报]

The damming of river systems in the northwestern United States has had damaging effects on salmon(鲑鱼). In the spring young salmon, called smolts, drift into rivers from smaller streams. They swim with the current downstream heading for the Pacific Ocean. Before the large-scale constructions of dams(水坝), the young salmon used the strong flow from melting snows to get to the sea in between six and twenty days. It is necessary to do this because during these days the smolts’ bodies undergo the physiological changes for adaptation to salt water.

Unfortunately, the current has become very slow due to the construction of numerous dams. Companies operating the dams also intentionally slow the current. They store the water from the melting snow until the winter, when more electric power is needed. The net result is that many of the young fish do not survive the now sixty-day trip to the sea. Consequently, there are fewer adult salmon to migrate(回游) back up the rivers for breeding. When the time comes for the salmon to return, they again face the problem of dams. As fewer adult salmon are able to get back to their cool upstream water, they fail to produce a sufficiently new generation of salmon.  This cycle could eventually lead to the extinction of the fish.

Attempts are being made to transport the young salmon down river by boats. However, many scientists think that this artificial method of getting the fish to the sea kills more than it saves. Another suggestion, recently proposed by environmentalists, is to increase the rate of water flow. This would be a partial(部分的) solution to the declining salmon numbers. One method of doing this would call for releasing water from upstream dam. This would speed up the downstream movement of the smolts.

Another method would be to reduce the water level in the dams for a period in the spring when the smolts are migrating downstream. This would also increase the flow rate temporarily without requiring large amounts of water and, thus, enable the young salmon to move downstream faster. Unfortunately, both of these proposals have met with criticism from the power companies, which strongly suggests the uncertain fate of the salmon in the region.

76. What’s the main topic of the passage?

A. The failure of adult salmon to reproduce.

B. The importance of smolts returning upstream.

C. The need for smolts to reach salt water quickly.

D. The harm caused to salmon by river damming.

77. The passage discusses all of the following methods of dealing with salmon issue EXCEPT _____.

A. carrying the fish in boats

B. allowing water to be released from upstream dams

C. dropping water levels in dams

D. breeding salmon

78. In paragraph 3, what does the author mean by the statement that many scientists think that this artificial method of getting the fish to the sea kills more than it saves?

A. Saving fish is artificial.

B. More fish die when transported than would die otherwise

C. Artificial methods of transportation give salmon the chance to get adapted to salt water.

D. The sea kills more fish than are saved by transportation.

79. Which of the following statements would the author most probably agree with?

A. The salmon problem is likely to continue.

B. A solution to the salmon problem will be found in the near future.

C. Salmon will be extinct very quickly. 

D. The government should step in and provide a way out.

 

查看习题详情和答案>>

  The trend in everyday conversation is to use grandiose(夸大的)words.“Outstanding” is the

new “good,”  “amazing” is the new “OK, ” and “huge” is the new “big.”

    I was in a restaurant in Washington D.C.last weekend and every question I asked was answered with exaggeration.

    Me:How is the salmon?

    Sever:Fantastic!

    Me:Does it come with rice?

    Sever:Absolutely!

    Would a “good” and a “yes” have been enough? Of course!

    My father is an average-sized man.He hasn’t gained weight or height for the past 30 years. Therefore, his size remains the same.However,in the same amount of time,his T-shirt size has gone from small to medium to large to extra large.

  The reason for the exaggerated word is clear:we are bored with our lives. We want the next

—next thing now.Immediately!

    And we also want others to think that we still care,that we can still be delighted,that we know that everything is just great.Even when deep inside we know it can’t be.Everything can’t be great.

  I’m not a scientist,so many methods of proof leave little to be desired,or a lot to be desired,or an immensity(无限).   

  Listen to the voices around you.Listen to your own voices.There is nothing on the radio that is good or bad,weather is either beautiful or horrible.

  Listen,the next time when someone asks you something and you agree,because when you

could simply say “yes”, instead you will say “absolutely’’ or “without doubt ” or “Oh,yeah,unquestionably ---- absolutely without doubt."

  Have people forgotten what it is like to be OK? Simply OK with what they have and who they are? If everything is outstanding,if everything is the most amazing thing ever,is anything ever amazing at all?

1.By telling his experience in the restaurant,the author intends to ________.

    A. show his interest in exaggerated words

    B. prove that exaggerated words are widely used

    C. blame the restaurant for using exaggerated words

    D. tell us the food in the restaurant is extremely good

2.What do we know about the author’s father?

    A. He has gained height and is now a tall man.

B. He likes following the fashion in clothing.

C. His weight is getting greater and greater.

D.The size of his T-shirt is described in exaggerated words.

3..So many people like using exaggerated words because_________.

    A. they are not satisfied with being normal

    B. they don’t want to be looked down upon by others

    C. they want to be different from others

    D. they are brave in telling their true feelings

4.According to the passage,if you approve of something,you’d better say “________”.

    A. fantastic    B. perfect    C. OK          D. absolutely

 

 

查看习题详情和答案>>

  The trend in everyday conversation is to use grandiose(夸大的)words.“Outstanding” is the

new “good,”  “amazing” is the new “OK, ” and “huge” is the new “big.”

    I was in a restaurant in Washington D.C.last weekend and every question I asked was answered with exaggeration.

    Me:How is the salmon?

    Sever:Fantastic!

    Me:Does it come with rice?

    Sever:Absolutely!

    Would a “good” and a “yes” have been enough? Of course!

    My father is an average-sized man.He hasn’t gained weight or height for the past 30 years. Therefore, his size remains the same.However,in the same amount of time,his T-shirt size has gone from small to medium to large to extra large.

  The reason for the exaggerated word is clear:we are bored with our lives. We want the next

—next thing now.Immediately!

    And we also want others to think that we still care,that we can still be delighted,that we know that everything is just great.Even when deep inside we know it can’t be.Everything can’t be great.

  I’m not a scientist,so many methods of proof leave little to be desired,or a lot to be desired,or an immensity(无限).   

  Listen to the voices around you.Listen to your own voices.There is nothing on the radio that is good or bad,weather is either beautiful or horrible.

  Listen,the next time when someone asks you something and you agree,because when you

could simply say “yes”, instead you will say “absolutely’’ or “without doubt ” or “Oh,yeah,unquestionably ---- absolutely without doubt."

  Have people forgotten what it is like to be OK? Simply OK with what they have and who they are? If everything is outstanding,if everything is the most amazing thing ever,is anything ever amazing at all?

By telling his experience in the restaurant,the author intends to ________.

    A. show his interest in exaggerated words

    B. prove that exaggerated words are widely used

    C. blame the restaurant for using exaggerated words

    D. tell us the food in the restaurant is extremely good

What do we know about the author’s father?

    A. He has gained height and is now a tall man.

B. He likes following the fashion in clothing.

C. His weight is getting greater and greater.

D.The size of his T-shirt is described in exaggerated words.

.So many people like using exaggerated words because_________.

    A. they are not satisfied with being normal

    B. they don’t want to be looked down upon by others

    C. they want to be different from others

    D. they are brave in telling their true feelings

According to the passage,if you approve of something,you’d better say “________”.

    A. fantastic    B. perfect    C. OK          D. absolutely

查看习题详情和答案>>

  The trend in everyday conversation is to use grandiose(夸大的)words.“Outstanding” is the
new “good,”  “amazing” is the new “OK, ” and “huge” is the new “big.”
I was in a restaurant in Washington D.C.last weekend and every question I asked was answered with exaggeration.
Me:How is the salmon?
Sever:Fantastic!
Me:Does it come with rice?
Sever:Absolutely!
Would a “good” and a “yes” have been enough? Of course!
My father is an average-sized man.He hasn’t gained weight or height for the past 30 years. Therefore, his size remains the same.However,in the same amount of time,his T-shirt size has gone from small to medium to large to extra large.
The reason for the exaggerated word is clear:we are bored with our lives. We want the next
—next thing now.Immediately!
And we also want others to think that we still care,that we can still be delighted,that we know that everything is just great.Even when deep inside we know it can’t be.Everything can’t be great.
I’m not a scientist,so many methods of proof leave little to be desired,or a lot to be desired,or an immensity(无限).   
Listen to the voices around you.Listen to your own voices.There is nothing on the radio that is good or bad,weather is either beautiful or horrible.
Listen,the next time when someone asks you something and you agree,because when you
could simply say “yes”, instead you will say “absolutely’’ or “without doubt ” or “Oh,yeah,unquestionably ---- absolutely without doubt."
Have people forgotten what it is like to be OK? Simply OK with what they have and who they are? If everything is outstanding,if everything is the most amazing thing ever,is anything ever amazing at all?
【小题1】By telling his experience in the restaurant,the author intends to ________.

A.show his interest in exaggerated words
B.prove that exaggerated words are widely used
C.blame the restaurant for using exaggerated words
D.tell us the food in the restaurant is extremely good
【小题2】What do we know about the author’s father?
A.He has gained height and is now a tall man.
B.He likes following the fashion in clothing.
C.His weight is getting greater and greater.
D.The size of his T-shirt is described in exaggerated words.
【小题3】.So many people like using exaggerated words because_________.
A.they are not satisfied with being normal
B.they don’t want to be looked down upon by others
C.they want to be different from others
D.they are brave in telling their true feelings
【小题4】According to the passage,if you approve of something,you’d better say “________”.
A.fantasticB.perfectC.OKD.absolutely

查看习题详情和答案>>

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网