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（生物體）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（洗滌劑）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


70---73   BDCC   

解析

練習冊系列答案
相關習題

科目：高中英語 來源： 題型：單選題

The drugaddict spent much money on his drug every day, ________ he became poorer and poorer.


  1. A.
    as a result
  2. B.
    as the result
  3. C.
    as a result of which
  4. D.
    as a result of

查看答案和解析>>

科目：高中英語 來源：2011屆安徽師大附中高三第一次模擬考試英語卷 題型：閱讀理解

Our boat floated on between walls of forest. It was too thick to allow us a view of the land we were passing through, though we knew from the map that our river must from time to time be passing through chains of hills which crossed the jungle plains. Nowhere did we find a place where we could have landed: where the jungle did not actually spread right down into the river, banks of soft mud prevented us form going ashore. In any case, what would we have gained by landing? The country was full of snakes and other dangerous creatures and the jungle was so thick that one would be able to advance slowly, cutting one’s way with knives the whole way. So we stayed in the boat, hoping that when we reached the sea, a friendly fisherman would pick us up and take us to civilization.
As for water, there was a choice. We could drink the muddy river water, or die of thirst. We drank the water. Men who have just escaped from what appeared to be certain death lost all worries about such small things as diseases caused by dirty water. In fact, none of us suffered from any illness as a result.
One day we passed another village, but fortunately nobody saw us. We did not wish to risk being taken prisoners a second time: we might not be so lucky as to escape in a stolen boat again.
【小題1】 It can be inferred from the passage that the only thing they could see in a boat was _______.     

A．wallsB．chains of hillsC．tall treesD．vast land
【小題2】From the passage, we can learn that _______.
A．the country was a civilized societyB．the country was a tropical jungle country
C．they found a place where they could landD．they were on a journey home
【小題3】According to the passage, what happened to the people in the boat at last?
A．They were arrested.B．They managed to escape to safety.
C．They were saved by some villagersD．The passage doesn’t mention it.
【小題4】 The best title for this passage might be _______.
A．The Problem of LandingB．An Adventure
C．An Entirely New ExperienceD．Escape

查看答案和解析>>

科目：高中英語 來源：2012-2013學年河北省存瑞中學高一第二次月考英語試卷（帶解析） 題型：閱讀理解

It’s a sure sign that summer is over and winter is on the way — leaves that were once deep green turn red, yellow and bright orange. It happens every autumn. But did you ever wonder why?
The leaves start changing color when the nights start getting longer and the temperature starts getting cooler. Some scientists think that as the number of daylight hours shrinks, the leaves stop making chlorophyll which makes plants green. The reason is that the process of making chlorophyll requires sunlight. But according to horticulture (園藝) educator Susan Rose from Colorado State University, it turns out leaves don’t really change color at all. “The fall colors are actually there all along,” she said. “But they are covered by the green chlorophyll. As the chlorophyll stops being produced, the other colors can shine through.”
The kind of color that the leaves are going to change to is determined by the plant’s genetic (基因的) background. In some places, the leaves start changing color in September — before autumn even officially begins. In other places, they don’t change until late October or even November. Some scientists say the leaves have been changing color later than usual in recent years. And they think global warming has something to do with that.
In one study, researchers found that the growing season in the Northern Hemisphere was nearly a week longer, on average, in 2008 than it was in 1982. And a professor from Harvard University found that the leaves, west of Boston, Massachusetts, are changing color about three days later than they used to. However, other scientists disagree with the global warming theory. Susan Rose said the leaves in her part of Colorado are changing “right on schedule.” But the leaves in other parts of that state are running a little late. “The lateness in the mountains may have something to do with the really warm late summer and early fall,” she said. “But I’m afraid that’s just a guess.”
【小題1】According to Susan Rose, _____.

A．the fall colors are always in leaves
B．leaves make chlorophyll all the seasons
C．leaves’ changing color have nothing to with the weather
D．leaves begin changing color because they start making chlorophyll
【小題2】The underlined word “shrinks” in Paragraph 2 could best be replaced by _____.
A．reducesB．increasesC．lastsD．appears
【小題3】Scientists guess leaves change color later than usual probably as a result of _____.
A．genetic background B．dry weather
C．global warmingD．low temperature
【小題4】The purpose of the last paragraph is to tell readers _____.
A．why leaves change color at fall
B．leaves change color at different time
C．the effects of the global warming on plants
D．different opinions on the lateness of leaves’ changing color

查看答案和解析>>

科目：高中英語 來源：廣東省新興縣惠能中學2011屆高三上學期第一次月考試題（英語） 題型：閱讀理解


II、閱讀（共兩節(jié)，滿分50分）
第一節(jié)閱讀理解（共20小題；每小題2分，滿分40分）
閱讀下列短文，從每題所給的A、B、C和D項中，選出最佳選項，并在答題卡上將該項涂黑。
A teenage girl is fighting for her life today after being struck by lightning as severe thunderstorms swept across Britain. The girl was one of four teenage girls from London who were hit by lightning in the Parade Ground area of Hyde Park during a storm. Earlier, Joseph Wharton, 14, died as he was struck by lightning while camping in his friend’s backyard in the West Midlands.
A spokesman for Scotland Yard said the girl remained in serious condition at St. Mary’s Hospital in Paddington. She had stopped breathing by the time the first paramedic (護理人員) arrived on the scene just two minutes after the strike at 5:40 p.m. yesterday.
The other three girls hit by the bolt all had injuries, and were taken to University College Hospital. Their conditions were not serious, the spokesman added.
The strike lifted the girls into the air and then dropped them to the ground, a witness reported.
A spokesman for the London Ambulance Service said paramedics risked their lives to treat the girls. “The storm was still overhead and lightning was still coming down while they were treating the patients,” he said. “All staff involved acted very professionally in providing fast treatment to these patients in very difficult circumstances.” Scotland Yard said the incident was being looked into by officers from the Royal Parks’ Operational Command Unit.
Joseph Wharton of Byland Way, Bloxwich, was hit during the extended thunderstorm which struck the region yesterday morning. He was pronounced dead at Walsall Manor Hospital.
He had been sleeping in a tent while staying with school friend Michael Lees at a house on nearby Cresswell Crescent.
West Midlands Ambulance Service said paramedics were called at 7:50 a.m. and unsuccessful attempts were made to revive（使蘇醒）the sports-mad teenager. A spokesman for the Royal Society for the Prevention of Accidents said four or five people die each year as a result of lightning strikes in the UK.
26、All four girls________.
A. were killed by the lightning                B. were seriously injured
C. were being treated at the same hospital   D. were lifted up and dropped to the ground
27、The underlined word “bolt” probably means “________”.
A. thunder             B. rain                  C. storm                      D. lightning
28、Which of the following is TRUE according to the passage?
A. The boy was killed after the four girls had been hit.
B. The paramedics began to treat the girls after taking them to the hospital.
C. First-aid was given to the girls during the storm.
D. The boy was hit by lightning in the Parade Ground area of Hyde Park.
29、It can be inferred from the passage that ________.
A. many British people die from lightning strikes every year
B. the writer blames the government for the accident
C. the paramedics could also have been hit by lightning while aiding the girls
D. Joseph had been playing in the open air before the strike
30、This passage is probably taken from a ________.
A. magazine       B. newspaper   C. science fiction    D. weather report

查看答案和解析>>

同步練習冊答案