In the long discussion of water on the Moon, ...

In the long discussion of water on the Moon, a new study contradicts(与……相矛盾)) some recent reports that say the Moon had water at the time of its formation. A group of researchers reported in the journal Science that when the Moon was created, some 4.5 billion years ago, there was not much hydrogen(氢气) on it, and therefore no water.

The researchers surveyed and evaluated this by analyzing chlorine isotopes（氯同位素） found in lunar rock samples from Apollo missions. The range of chlorine isotopes in lunar samples was 25 times that found in samples from Earth.

If the Moon had significant levels of hydrogen, as Earth did, this range would have been far less, said Zachary D Sharp, a scientist in the Department of Earth and Planetary Sciences at the University of new Mexico and the study’s lead authour.

The chlorine would have stuck together with hydrogen, forming compounds like hydrogen chloride, and escaped from the Moon’s surface, he said. The abundance of chlorine indicates a lack of hydrogen and water.

“ The amount of water on the Moon was too low for life to possibly have existed there,” he said.

Most scientists believe the Moon was formed when a large object stuck Earth, breaking off a chunk(a vast piece) that has since orbited Earth.

On Earth, goes one theory, water was released as steam form molten basalts(玄武岩) over time, eventually forming bodies of water.

“An understading of whether the Moon was dry or wet will help us understand how water appeared on Earth,” Dr Sharp said.

1. A new study indicates that _____ on the moorn.

A. there is plenty of water              B. water is unlikely to exist

C. water existed in the past             D. there is a little water now

2. The author would like to tell us ______ through the sixth paragraph.

A. why there is no water on the Moon     B. how the Moon was formed

C. when the Earth struck the Moon       D. where the Moon orbited

3.  Which is NOT true according to the passage?

A. Zachary D. Sharp, a scientist of New Mexico was in charge of the new study.

B. Chlorine isotopes in lunar samples are 25 time larger than those on the Earth.

C. The more aboundant chloride, the shorter hydrogen and water.

D. The new study is benificial to understand how water appeared on Earth.

4. What can we learn from the passage?

A. There is enough water on the Earth.

B. Hydrogen chloride easily escaped from the Moon’s surface.

C. The Earth had significant levels of hydrogen.

D. Water on the Earth is directly from molten basalts.

高三英语阅读理解中等难度题查看答案及解析

In a new look at the impact of long-time sitting behavior on health, a new study links time watching television to an increased risk of death. One of the most surprising findings is that it isn’t just couch potatoes who were affected. Even for people who exercised regularly, the risk of death went up the longer they were in front of the TV. The problem was the long periods of time spent sitting still.

Australian researchers who tracked 8,800 people for an average of six years found that those who said they watched TV for more than four hours a day were 46% more likely to die of any cause and 80% more likely to die of cardiovascular (心血管的) disease than people who reported spending less than two hours a day in front of TV.

Time spent in front of TVs and computers and videogames has come under fire in studies in recent years for contributing to a spread of obesity in the US and around the world. But typically the resulting public-health message urges children and adults to put down the Xbox controller and remote and get on a treadmill (跑步机) or a soccer field.

The Australian study offers a different view. “It’s not the sweaty type of exercise we’re losing,” says David Dunstan, a researcher at Baker IDI Heart and Diabetes Institute, Melbourne, who led the study. “It’s the incidental moving around, standing up and using muscles. That doesn’t happen when we are plunked on a couch in front of a television.”

Indeed, participants in the study reported getting between 30 and 45 minutes of exercise a day, on average.The results are supported by a new field of research that shows how long periods of inactivity can affect the body’s processing of fats and other substances that contribute to heart risk. And they suggest that people can help decrease such risk simply by avoiding extended periods of sitting.”

Keeping such processes working more effectively doesn’t require constant intense exercise, but consciously adding more routine movement to your life might help, doctors say. “Just standing is better than sitting,” says Gerard Fletcher, a cardiologist at Mayo Clinic, Jacksonville, Fla., who works standing up at his computer. “When you stand up, you shuffle around a little bit and use muscles not required when you are sitting or lying down.”

Simple strategies for increasing activity include combining household chores such as folding laundry with TV-watching time or getting up to change a TV channel rather than using a remote control. The report, published Tuesday in the American Heart Association journal Circulation, focuses on TV watching in part because it is the main leisure-time activity in many countries, researchers said, especially in the US.

1.One misunderstanding people might have is that ________.

A. the radiation from TV may badly affect your sight

B. TV programs can broaden your horizons effectively

C. watching TV very long is a good way to kill time

D. regular exercise can minimize the side effect of watching TV

2.What is new about the discovery of the Australian study?

A. Remote control shouldn’t be used when people watch TV.

B. People who watch TV too long should take more physical exercise.

C. Sitting too long in front of TV will lead to high risk of heart attack.

D. Long-time sitting is bad for all people including those who exercise regularly.

3.According to the Australian study, how can the risk of death be reduced when people watch TV?

A. By increasing simple movement.

B. By totally avoiding watching TV.

C. By taking some medicine.

D. By increasing sweaty type of exercise.

高三英语阅读理解中等难度题查看答案及解析

— I dreamed of some animals running on the moon.

— It ____ be. There is no air or water on the moon, you know.

A. can’t           B. may not          C. shouldn’t           D. mustn’t

高三英语选择题中等难度题查看答案及解析

—I dreamed of some animals running on the moon.

—It________be. There is no air or water on the moon，you know.

A．can't             B．may not           C．shouldn't          D．mustn’t

高三英语阅读理解中等难度题查看答案及解析

Scientists are making new studies of color and its effects on our health. They have known for a long time that the color of a room or the color of the light in it can affect our feelings and emotions. Many prisons and hospitals have at least one room that is painted pink. Officials have found that light and color can produce physical changes in our bodies.

Professor Falfan worked with a group of 9 disabled children at school in Albert. Two of the children were blind. The other seven had normal sight. The scientists changed the color of the school room, and then looked for changes in blood pressure, heart beat and breathing rate. The effects of color changes were the same for the blind children as for those with normal sight. Their blood pressure dropped from about 120 to 100. Similar changes were reported in heart-beat and the breathing. The children were also calmer and less excited. Then the colors of the room were returned to orange and white. Blood pressure, heart-beat and breathing rate went up and the children became excited again.

Professor Falfan said different colors produce different levels of light energy. He said the differences seem to affect chemicals in the brain that carry messages from nerve to nerve and from nerve to muscle.

1. Light and color can affect　　.

A. only one’s feelings and emotions

B. one’s energy

C. one’s mental changes

D. one’s heart-beat, brain activities, blood pressure, feelings and emotions

2. The color of pink had a calming effect, that is to say, the color affects　　.

A. the chemicals in the brain

B. the eyes

C. the skin

D. the muscle

3.According to the text, orange and white are colors which can make people　　.

A. calm　　B. active　　C. sick　　D. blind

13. The colors in the school room mentioned in the passage were changed from　　.

A. orange to white

B. orange to dark blue

C. orange and white to pink or some other colors

D. gray to more colors

4. After reading the passage we can conclude that　　.

A. blind people can be affected by colors, too

B. one’s heart will beat faster in a colorful room than in a white room

C. the chemicals in the brain change with feelings and emotions

D. if one’s blood pressure drops, his breathing will get slower and slower

高三英语阅读理解中等难度题查看答案及解析

A new study warns that about thirty percent of the world's people may not have enough water by the year 2025.

A private American organization called Population Action International did the new study. It says more than three-hundred-thirty-five-million people lack enough water now. The people live in twenty-eight countries. Most of the countries are in Africa or the Middle East.

P-A-I researcher Robert Engelman says by the year 2025, about three-thousand-million people may lack water. At least 18 more countries are expected to have severe water problems. The demand for water keeps increasing. Yet the amount of water on Earth stays the same.

Mr. Engelman says the population in countries that lack water is growing faster than in other parts of the world. He says population growth in these countries will continue to increase.

The report says lack of water in the future may result in several problems. It may increase health problems. Lack of water often means drinking waters not safe. Mr. Engelman says there are problems all over the world because of diseases, such as cholera, which are carried in water. Lack of water may also result in more international conflict. Countries may have to compete for water in the future. Some countries now get sixty percent of their fresh water from other countries. This is true of Egypt, the Netherlands, Cambodia, Syria, Sudan, and Iraq. And the report says lack of water would affect the ability of developing to improve their economies. This is because new industries often need a large amount of water when they are beginning.

The Population Action International study gives several solutions to the water problem. One way, it says, is to find ways to use water for more than one purpose. Another way is to teach people to be careful not to waste water. A third way is to use less water of agriculture.

The report also says long-term solutions to the water problem must include controls on population growth. It says countries cannot provide clean water unless they slow population growth by limiting the number of children people have.

1. 　　　　　　 are expected to have severe water problems by the year 2025.

A. 46 countries　　　　 B. 18 countries

C. 28 countries　　　　 D. No countries

2. All the following are true except　　　　　　　　 .

A. Lack of water may cause conflict between countries

B. New industries need a lot of water

C. There are solutions to the water problem

D. Egypt now has enough fresh water

3..What can be inferred from the passage?　　　 .

A. There is connection between providing clean water and slowing population growth

B. Lack of water may also result from international conflict

C. The ability of developing has nothing to do with lack of water

D. It is not known whether diseases have something to do with lack of water

4.The best title of the passage would be 　　　　　　 .

A. World Conflict　　　　　　 B. World Water Shortage

C. Diseases and Water　　　　 D. Population and Water

高三英语阅读理解中等难度题查看答案及解析

Health experts have long worried about the increasing rate of obesity in kids. It’s an important concern: Being very overweight or obese during childhood can lead to serious problems normally seen in adults, such as diabetes and high blood pressure. Poor diets and a lack of exercise are usually the causes. But would you ever have imagined there might be a connection between the bacteria that lived in your guts （内脏）when you were a baby and the chance that you would become overweight?

Scientists in Finland recently found just such a link. In a recent study, they showed that overweight kids had different species of bacteria living in their guts.

You probably think of bacteria only as germs that can make you sick. While it’s true that some bacteria can make people ill, your body actually depends on some types of bacteria to help you digest food and extract nutrients from it. These “good” bacteria live in your guts, where they process the food you eat.

Human babies get these bacterial helpers from their moms. When a baby is born, some of the bacteria in the mother move into the baby’s body. Growing babies get additional “good” bacteria from the milk their mothers produce. And it turns out the bacteria might play an important role in regulating weight just six years later.

So how could these bacteria affect weight? The researchers still haven’t tested that question, but future tests might lead to an answer.

1.The “link” in Paragraph 2 refers to the relationship between _______.

2.Which of the following is NOT the function of “good” bacteria?

3.The purpose of writing this passage is to _______.

高三英语阅读理解中等难度题查看答案及解析

In their spare time, they will discuss the _____ to the study of English.

A. means　　　　　　　　 B. approaches

C. methods　　　　　 　 D. Ways

高三英语单项填空中等难度题查看答案及解析

A new study indicates that basic steps taken by people daily can go a long way in ____ the greenhouse gas emission.

A. cutting down    B. taking down

C. pulling down   D. breaking down

高三英语单项填空中等难度题查看答案及解析

The idea of being able to walk on water has long interested humans greatly. Sadly, biological facts prevent us ever accomplishing such a thing without artificial aid---we simply weigh too much, and all our mass pushes down through our relatively small feet, resulting in a lot of pressure that makes us sink.

However, several types of animals can walk on water. One of the most interesting is the common basilisk Basilicus basilicus, a lizard (蜥蜴)native to Central and South America. It can run across water for a distance of several meters, avoiding getting wet by rapidly hitting the water’s surface with its feet. The lizard will take as many as 20 steps per second to keep moving forward. For humans to do this, we，d need huge feet that we could bring up to our ears in order to create adequate w hitting. ’’

But fortunately there is an alternative : cornflour. By adding enough of this common thickening agent to water (and it does take a lot), you can create a “non-Newtonian” liquid that doesn’t behave like normal water. Now, if the surface of the water is hit hard enough, particles(粒子）in the water group together for a moment to make the surface hard. Move quickly enough and put enough force into each step, and you really can walk across the surface of an adequately thick Liquid of cornflour.

Fun though all this may sound, it’s still rather messy and better read about in theory than carried out in practice. If you must do it, then keep the water wings handy in case you start to sink--and take a shower afterward!

1.Walking on water hasn’t become a reality mainly because humans______.

A. are not interested in it

B. have biological limitations

C. have not invented proper tools

D. are afraid to make an attempt

2.What do we know about Basilicus basilicus from the passage?

A. It is light enough to walk on water.

B. Its huge feet enable it to stay above water.

C. It can run across water at a certain speed.

D. Its unique skin keeps it from getting wet in water.

3.What is the function of the cornflour according to the passage?

A. To create a thick liquid.

B. To turn the water into solid.

C. To help the liquid behave normally.

D. To enable the water to move rapidly.

4.What is the author’s attitude toward the idea of humans’ walking on water?

A. It is risky but beneficial.

B. It is interesting and worth trying.

C. It is crazy and cannot become a reality.

D. It is impractical though theoretically possible.

高三英语阅读理解中等难度题查看答案及解析