Nuclear radiation （核辐射）has a certain mystery,...

Nuclear radiation （核辐射）has a certain mystery, partly because it cannot be detected （探测）by human senses. It can’t be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can’t detect them or sense them without a radio receiver. Similarly, we can’t sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things.

At very high levels, radiation can kill an animal or human being at once by killing plenty of cells in important organs(器官). Even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be serious. This is the case when only a few cells are hit, and when they are killed at once. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in an unusual way. They can grow into cancer. Sometimes this does not show up for many years.

This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the knowledge of the person at the time that damage has occurred. A person can be irradiated(放射治疗) and feel fine, then die of cancer five, ten, or twenty years later as a result. A child can be born weak or easy to get serious illness as a result of radiation absorbed by its grandparents.

1.According to the passage, the danger of nuclear power lies in ________.

2.Radiation can lead to serious trouble even at the lowest level  ________.

3.What does the author want to tell us?

高二英语阅读理解简单题查看答案及解析

A regular drop in the sun’s radiation(辐射) can cause unusually cold winters in parts of North America and Europe, scientists say, a finding that could improve long-range forecasts and help countries prepare for snowstorms.

Scientists have known for a long time that the sun has an 11-year cycle during which radiation measured by sunspots on the surface reaches a peak then falls. But explaining a clear connection to weather is harder.

“Our research confirms the observed connection between solar change and regional winter climate,” lead author Sarah Ineson of the UK Met Office told the reporters in an email. The study was published in the magazine Nature Geoscience on Monday.

The researchers found that the reducing of ultraviolet(UV，紫外线) radiation from the sun can affect high-altitude wind patterns in the Northern Hemisphere(半球), causing cold winters.

“While UV levels won’t tell us what the day-to-day weather will do, they show us the bright future of improved forecasts for winter conditions for months and even years ahead. These forecasts play an important role in long-term possibility planning,” Ineson, a climate scientist, said.

Ineson and colleagues from Imperial College London and the University of Oxford used satellite data that more accurately(精确的) measures UV radiation from the sun and found a much greater change than previously thought.

They found that in years of low activity, unusually cold air forms high in the atmosphere over the tropics. This causes a redistribution(重新分配) of heat in the atmosphere, making easterly winds that bring freezing weather and snowstorms to northern Europe and the United States and milder weather to Canada and the Mediterranean.

When solar UV radiation is stronger, the opposite occurs.

More study was needed, though. A key uncertainty in the experiment lay in the satellite data used, because it covers only a few years. “So questions remain concerning both accuracy(精确) and also applicability to other solar cycles,” she said.

1.The new finding claims cold winters in the North Hemisphere can be caused by ______.

A. a sharp rise in the amount of sunspots

B. a drop in the sun’s UV radiation

C. a complex computer model simulation

D. a clear link between the sun and the earth

2. It has long been known by scientists that ______.

A. UV radiation can affect high-altitude wind patterns

B. there’s a clear connection between the sun’s activity and weather

C. the sun’s radiation reaches a peak every eleven years

D. they can predict day-to-day weather conditions from UV levels

3. What will happen if the sun turns into years of high activity according to the finding?

A. Canada and the Mediterranean will have milder weather.

B. The whole Northern Hemisphere will suffer from extreme winter days.

C. Freezing cold weather will appear in northern Europe.

D. Burning hot weather will appear in the United States.

4. It can be inferred from the passage that ______.

A. researchers have analyzed the data collected in eleven years

B. long-term weather conditions can be accurately predicted depending on UV levels

C. the research doesn’t seem correct and true enough due to limited satellite data used

D. climate scientists have just begun their research in severe weather forecast

高二英语阅读理解中等难度题查看答案及解析

_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in human bodies.

A. Exposed　　 　　　　 B. Being exposed

C. Having exposed　 D. After being exposed

高二英语单项填空中等难度题查看答案及解析

_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in human bodies.

A. Exposed 　　　　 　 B. Being exposed

C. Having exposed　 D. After being exposed

高二英语单项填空中等难度题查看答案及解析

_____to nuclear radiation, even for a short time , may produce variants(变异体) of genes in human bodies.

A. Being exposed　　　　　　　 B. Having expose

C. Exposed　　　　　　　　　　　 D. After being exposed

高二英语单项填空中等难度题查看答案及解析

The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.

A. be exposed          B. have been exposed       C. exposed       D. be exposing

高二英语单项填空简单题查看答案及解析

____ to nuclear radiation, even for a short time, may produce variants of genes in human body.

高二英语单项填空简单题查看答案及解析

_________to nuclear radiation, even for a short time, may produce variants of genes in human bodies.

A. Being close　　 B. Having been closed

C. Closed　　 D. After being closed

高二英语单项填空中等难度题查看答案及解析

People exposed to radiation are more _______ to suffer from certain forms of cancer, which can be ______ but can’t be ______at present.

A．more likely; treated; cured                B．more probable; treated; cured

C．more possible; cured; treated              D．more likely; cured; treated

高二英语单项填空中等难度题查看答案及解析

单词拼写

1.All the people in that country are taking part in a c_____________ against nuclear weapons.

2.It’s hard to imagine how this quiet volcano d____________ the whole city.

3.The news is almost ceertainly true although it is not __________________ (官方的).

4.You will find some pictures ________________ (附在) to the e-mail.

5.She always has an o______________ attitude towards life, and she never feels discouragerd.

高二英语单词拼写简单题查看答案及解析