Radioactive(放射性的) pollution can be said to be...

Radioactive(放射性的) pollution can be said to be the emission(排放) of radioactive substance into air, water or land due to human activities in the form of radioactive waste. Radioactive waste is usually the product of nuclear fission(核裂变), which is widely used in nuclear power stations and nuclear weapons.

The radioactivity of nuclear waste decreases with time. That means the waste needs to be separated from the reach of living beings until it no longer causes a threat to living beings. This time period may take from days to months and to years depending upon the radioactive nature of the waste.

Radioactive pollution that is spread through the earth’s atmosphere is called ‘fallout’. Nuclear pollution began to attract people’s attention during the World War II period when the United States, Britain and the Soviet Union started conducing nuclear tests. The best example of fallout is the nuclear bomb attack on Hiroshima and Nagasaki, Japan in 1945 by the United States of America during World War II. As a result of the bomb attack, nearly 225,000 people died within 5 years of the attack due to the radiation effects and cancer.

In land and water, the major source of radioactive pollution remains with the nuclear fuel cycle(核燃料循环). The nuclear fuel cycle is used in nuclear power stations and extraction(提炼) of materials from nuclear substance, where the pollutants are left behind after the useful material has been extracted.

The effects of radioactive pollution were first reported in the early 20^th century when people working in uranium mines(铀矿井) suffered from skin burn and cancer. The effects vary from one individual to another. Exposed to radioactive radiations for a long time, living beings may suffer from the damage to the DNA cells, which results in cancer, genetic defects for the generations to come and even death.

In a word, since every coin has its two sides, it’s a good idea to prevent from its disadvantages while making full use of its advantages.

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If the rose can be said to be a special flower, then the apple can be said to be a special fruit. It is very important in American culture. American stories speak of Johnny Appleseed, who went throughout America collecting apple seeds and planting apple trees. He had a great love for nature and went through fields and farms adding richness and beauty to the country.

One of the first sayings taught to school children is, "An apple a day keeps the doctor away." This short saying encourages children to eat fresh fruit to keep healthy. If someone always says good words to a person, people will call him an "apple polisher". This, however, is not a good name. If someone is very dear to us, we say that he or she is the "apple of our eye".

Most people believe that the fruit which Eve gave to Adam was an apple, even though the Bible(圣经) never says so. The apple, therefore, is a deep part of the language and stories of America.

An apple is also delicious. Apples can be cooked in many ways, used as a dessert (甜点) , and made into sweet juice.

In many parts of the country during the harvest season, a popular activity is to go into an apple garden to pick apples. Washington, D. C. and New York are both famous for their apples.

Finally, when it’s time to take a vacation to American cities, one can always visit New York, which is "the biggest apple" of all the American cities.

1.Why was Johnny Appleseed so famous?

2.What does the underlined phrase "apple polisher" mean?

3.Which of the following is TRUE with apples?

4.The passage is mainly about______.

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______ the assignment said above, you have to write a 200-word composition on environment pollution.　

A. In addition　　　　 　 B. Apart from　　　　　 C. Except　　　　　 D. Other than

高二英语单项填空简单题查看答案及解析

_______ the assignment said above, you have to write a 200-word composition on environment pollution.

高二英语单项填空中等难度题查看答案及解析

International experts meeting in Australia say global carbon emissions (排放) can be reduced by more than 50 percent through simple energy saving measures. People at a conference in Australia, which increasingly relies on coal for power, say that reducing power consumption is an affordable way to both cut energy costs and reduce pollution.

While many nations turn to cheap and dirty energy sources, such as coal, to meet their increasing energy needs, analysts in Australia say the best way to meet those needs is to improve energy efficiency.

A range of simple solutions include using energy-efficient homes, household appliances and lighting, and driving electric cars. Encouraging homeowners and office workers to switch off their televisions and computers at the end of the day is also seen as an effective way to save electricity.

Grayson Heffner, from the Paris-based International Energy Agency, says reducing consumption could greatly cut global carbon emissions. He calls efficiency strategies (策略) the “soft giant” of clean energy.

“We forecast that energy efficiency will deliver something like three-quarters of the greenhouse gas emissions reductions over the next 20 years. So in the short term energy efficiency is the main way that we reduce greenhouse gas emissions but oftentimes it is not so importantly stressed in the discussions,” said Heffner.

Energy experts working in China say the government is making significant cuts in power usage.

Wan Xingwang, a Beijing-based representative of the Energy Foundation, a U.S. non-government organization, says the results have been impressive.

“In the past five years China achieved about 19.1 percent of energy reduction of its GDP. That translates to something like more than 600 million tons of coal savings,” said Wan Xingwang.

While most nations have some sort of government-sponsored energy efficiency programs, energy analysts say initiatives (主动性) by individuals and companies can also help cut demand.

Steven Nadel, executive director of the American Council for an Energy Efficient Economy, a non-profit group based in Washington, says other developing nations are recognizing the benefits of cutting power consumption and taking action.

1.To increase their energy supplies, many nations _____________________.

A．turn to new energy                      B．turn to cheap energy

C．develop solar energy                    D．introduce clean energy

2.Which of the following cannot help to reduce energy consumption effectively?

A．Using electronic products in small size.

B．Using more electric cars.

C．Turning off computers after work.

D．Building energy-efficient houses.

3.What can we learn from what Grayson Heffner said?

A．75% of the greenhouse gas emissions can easily be cut in the next 20 years.

B．Ways to reduce greenhouse gas emissions should be discussed.

C．Using clean energy is the strategy to cut global carbon emissions.

D．The key to reducing greenhouse gases in the short term is to improve energy efficiency.

4.According to the last two paragraphs, which of the following statements is true?

A．The programs reducing energy consumption shouldn’t be sponsored by individuals and companies.

B．All nations have government-sponsored energy efficiency programs.

C．It is time that all nations should combine their efforts to save energy.

D．Some developing nations are taking action to cut power consumption.

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At the meeting they discussed three different _______ to the study of radioactive waste.

A．means            B．methods          C．approaches        D．ways

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Long-time exposure to air pollution can lead to physical changes in the brain and cause trouble in learning and memory, and even anxiety. This is suggested by the results of new research on mice.

While other studies have shown the harmful effects of polluted air in the lungs and heart, this is the first to show the negative effect on the brain.

The team of Laura Fonken, Randy Nelson, from the Ohio State University, USA, has spread to the brain a previous line of research which found that fine particulate (微粒) matter floating in the air mainly because of air pollution caused by humans, causes swelling in much of the body, and may be related to high blood pressure problems, and some other diseases.

In the research Fonken and his colleagues exposed mice to polluted air for six hours each day, five days a week, over a period of 10 months, almost half the average life length of mice.

Polluted air contains fine particles created by cars, factories and natural dust. Fine particles of this kind are tiny, about 2.5 micrometers in diameter, or about one-thirtieth the width of a human hair. These particles can go deep into lungs and other organs.

The concentration of this particulate material to which they exposed mice is equal to the concentration at which people can be exposed in some polluted urban areas.

After a period of 10 months, the researchers got the animals to have a series of behavioral tests. Both the behavior of mice and the results of neurological(神经的) tests done to them show that those within the polluted air had more problems in learning and memory, and higher levels of anxiety.

The results suggest that long-time exposure to polluted air can have measurable negative effects on the human brain and can cause a variety of mental health problems. This could have important consequences for those living and working in polluted urban areas.

1.The results of new research on mice first suggest that polluted air mainly does harm to ________.

A. normal organs                    B. lungs and heart

C. mental health                    D. blood pressure

2.The bad effects of tiny particles in polluted air are those except ________.

A. high blood pressure problems

B. making human hair thinner

C. different kinds of diseases

D. swelling in much of the body

3.From the last sentence we can infer that people living in polluted urban areas ________.

A. are likely to suffer from mental problems

B. can measure the negative effect on them

C. show little concern for air pollution

D. can be exposed to polluted air longer

4.Which of the following is the best title for the passage?

A. Long-time Exposure to Air Pollution

B. Evidence and Concern of Air Pollution

C. Measurable Effect on Human Brain

D. Mental Problems Caused by Air Pollution

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We  have been trying all measures to reduce pollution in the past few years. Now people can enjoy a fresh environment everywhere. The following two graphs are adopted from the column of “City Information” on the webpage of Beijing Review.

Graph 1: Olympic Cities Air Quality Report

Graph 2: Chinese National Standard

Notes:

**API stands for Air Pollution Index(指数).

**Particulate matter (PM10) is a major component of air pollution that threatens both our health and our environment. It consists of very small liquid and solid particles floating in the air.

**Sulfur dioxide(SO2) acts as an acid．Inhalation(吸入) results in labored breathing, coughing, or a sore throat and may cause permanent lung damage.

1.According to Graph 1, which of the following cities has the worst air pollution?

2.If your city is symbolized by either red or purple, the pollution in your city is________.

3.Which of the following statements is TURE?

4.When more citizens are beginning to have labored breathing soon after they are in the open air, it suggests that________.

高二英语阅读理解简单题查看答案及解析

People who can’t ____between colours are said to be colour -blind.

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It is said that shyness is a disease or mental condition that can be cured. I prefer to think of it as an emotional disability. It's something we are born with and something we carry with us in our entire lives. There are too many people, however, who seem to be determined to find some ways of doing away with their shyness. In my opinion, it's a waste of time. I don't mean that we should do nothing about it. Quite the contrary, I think we need to separate the basic fact of shyness from our ability to take part in a social environment.

Look at one of the most famous shy people of them all, Tony White. This man is painfully shy, yet for decades he made a living talking and associating(交往) with different people every night, in front of a national audience.　 White has never done away with his shyness, but he has successfully found a　　 way to deal with it to the extent that he could be, not just a talk show host, but a legend(传奇) among talk show hosts.　 Look also at Amy Lee, who has recently admitted her problem with shyness. This is a woman who has appeared in many films, TV shows and interviews, yet in her early years she was so shy that she turned down a lunch invitation from Jane Fonda because she was terribly afraid of meeting her.

I guess that our shyness is there because each of us is born with some insecurity(不安全感) and this insecurity prevents us from reaching out to others the way people with a more open personality do. As we grow up and become adults, we allow our social skills to grow and develop. But we are still stuck in kindergarten or elementary school or wherever it was when our shyness took root in our soul.

1.In the author's view, shyness can be explained as ______.

A. an emotional disability

B. a not very normal mental condition

C. a disease that can be easily cured

D. something we pick up after birth

2.The underline expression “doing away with” most probably means “_____”.

A. keeping away from

B. getting rid of

C. catching up with

D. doing well in

3.Which of the following is TRUE of Tony White?

A. He was described as a hero in some legend books.

B. He didn’t dare to speak in front of a national audience.

C. He has dealt with shyness very successfully.

D. He failed to become a good talk show host.

4.The passage tells us that Amy Lee was ______

A. proud all the time

B. impolite when young

C. close to Jane Fonda

D. shy in her early years

高二英语阅读理解中等难度题查看答案及解析