If teens could reduce the salt they take in e...

If teens could reduce the salt they take in every day by 3,000 milligrams (mg), they would cut their risk of heart disease and stroke(中风) greatly in adulthood, researchers say.

Based on the results of a computer modeling analysis, researchers found that a 3,000 mg reduction in sodium(钠) by teenagers could reduce hypertension by 30 percent to 43 percent when they become adults.

Hypertension, or high blood pressure, is a common condition that may have no symptoms for years, but can eventually cause serious health conditions, including heart attack and stroke.

Other benefits over time as teens hit 50 years of age include a 7-12 percent reduction in coronary heart disease(冠心病), an 8-14 percent reduction in heart attacks, and a 5-8 percent reduction in stroke.

Fast food typically contains too much sodium. One bag of Nacho Cheese Doritos has 310 milligrams. Pizza is one of the biggest problems for teens when it comes to sodium, according to data from the National Center for Health Statistics.

“The additional benefit of lower salt intake early is that we can hopefully change the expectations of how food should taste, ideally to something slightly less salty,” says Dr. Kirsten Bibbins-Domingo, the lead author of the study and associate professor of medicine at the University of California, San Francisco.

“Most of the salt we eat is not from our salt shaker(盐瓶), but salt that is already added in food that we eat.” she added.

1.Which is a benefit of a low sodium diet according to the text?

A．No risk of heart disease.   B．Smaller chance of stroke.

C．Low blood pressure.      D．Slightly more heart attacks.

2.According to the text, 3,000 mg less salt intake daily will reduce hypertension by ________ in adulthood.

A．7%-12%      B．8%-14%      C．30%-43%    D．5%-8%

3.What does Dr Kirsten Bibbins-Domingo mean in the last two paragraphs?

A．A lower sodium diet can get teenagers used to less salty food.

B．A good eating habit can help teens have less junk food.

C．Teens should avoid pizzas and other salty foods.

D．We can add more salt from our salt shaker to the food.

4.Which of the following can be the best title for the text?

A．Teens Cutting Salt for Healthier Adulthood

B．Diet and Health

C．Sodium Brings Health Concerns

D．A Cause of Hypertension

高三英语阅读理解中等难度题查看答案及解析

If we planted a lot more trees in just the right places, they could reduce the amount of carbon in the atmosphere to levels not seen since the 1920s, said study leader Jean Francois Bastin, an ecologist from the Swiss Federal Institute of Technology. After examining more than 70,000 high-quality satellite photos of trees from all over the planet, ecologists concluded that the earth could support 900 million additional hectares (公顷) of tree cover.

Bastin and his colleagues developed a computer program that estimates how much forested land could be restored both now and in a future warmer world. The team members combed through 78,774 satellite photos of a variety of ecosystems- everywhere from the thick Amazon rainforest to the dry Sahel in Africa-that had been protected from human influence. They counted every tree in every photo to assess the current tree coverage in natural environments. The researchers combined that information with data about the climate, temperature and soil conditions for each ecosystem. Then they taught their program to put it all together to determine how much tree coverage a particular area could support.

The result shows trees currently cover 2.8 billion hectares of land- but they have the potential to populate as much as 4.4 billion hectares. Right now, much of the additional 1.6 billion hectares is being used for agriculture or urban spaces. The researchers took those areas off the table and saw that the earth still has 900 million hectares ready and waiting to be restored with trees an area roughly the size of Brazil. When those trees mature, they could remove 205 gigatonnes (兆吨) of carbon from the atmosphere, the study calculated, That represents about two-thirds of the roughly 300 gigatonnes of atmospheric carbon that can be traced to human actions, they said.

Even if trees are planted in the most mindful way, other actions are still needed to fight climate change, Bastin said.

1.Why did Bastin develop a computer program?

A.To reduce air pollution in Africa.

B.To determine carbon dioxide in the air.

C.To assess the potential forested land.

D.To calculate the area of forest in the world.

2.What does the underlined phrase “combed through” in Paragraph 2 refer to?

A.Looked into. B.Put away.

C.Brought back. D.Took in.

3.What can we infer from what Basin said in the last paragraph?

A.Brazil has large areas to plant trees.

B.The tree cover is not enough to control greenhouse gases.

C.Trees removed two-thirds of carbon in the atmosphere.

D.Other actions are equally important compared to planting trees.

4.What is the author’s attitude towards the research result?

A.Disapproving. B.Doubtful.

C.Supportive. D.Objective.

高三英语阅读理解困难题查看答案及解析

Do you believe drinking a glass of wine every day ______ reduce the danger of heart diseases?

A．could            B．must             C．need             D．should

高三英语单项填空中等难度题查看答案及解析

Flowers suddenly burst out everywhere on the same day every spring, as if they ________ in tune with one another.

A．are              B．were             C．have been         D．are to be

高三英语单项填空简单题查看答案及解析

The doctor asked him___________ the amount of salt in his diet.

A. to reduce　　 B. reduce　　　　 C. reduced　　　 D. reducing

高三英语单项填空中等难度题查看答案及解析

We are so tired. ______ we could take the day off tomorrow!

A. Only if  B. What if C. If only   D. If so

高三英语单项填空中等难度题查看答案及解析

I love roller coasters. If I could ride roller coasters every day for the rest of my life I would die a really 　　　 man. I will stand in line for40minutes just to get on a ride that lasts 30 seconds. Each step that I take brings me closer and closer to my　　　 of going on a ride of a lifetime. The 　　　 has me skipping around like a 4 year old.

But during my first ride there, that kind of thrill turned to absolute　　　 when I made it to the front. 　　　 waiting in line I was now having a second thought. Quietly, I negotiated within myself about my courage to go through with this 　　　

From far away it looked 　　　 but when I was about to get in the driver’s seat I 　　　 I forgot my license. After some self motivation I finally made the move to 　　　 my seat.

On my way up I could clearly see the ups and downs 　　　 me. To me they were not only the route but also 　　　 challenges. Soon the track was full of such 　　　 tunnels that I could see only what was behind me but not in front.

　　　 there were people around me with both of their hands in the 　　　 while I， knowing that things were going to get 　　　 grasped the handle on my seat. I wouldn’t dare celebrate something that 　　　 me.

Just like roller coasters,　　　 is full of ups and downs, darkness and light, and is unpredictable when we go through various 　　　 situations. The best thing to do when we meet anything 　　　 is to lift our hands and 　　　 whatever we do.

1.A. Old　　　　　　 B. Happy　　　　　 C. Brave　　　　 D. unusual

2.A. Tension　　　　 B. Hardship　　　 C. Motivation　 D. opportunity、

3.A. Excitement　　 B. Expectation　 C. Pleasure　　 D. anxiety

4.A. Patience　　　 B. Anger　　　　　 C. Desire　　　　 D. fear

5.A. Unless　　　　 B. Though　　　　 C. After　　　　 D. Upon

6.A. Competition　 B. Commitment　　 C. Debate　　　　 D. experiment

7.A. Fun　　　　　　 B. Small　　　　　 C. Normal　　　　 D. mysterious

8.A. Regretted　　 B. Realized　　　 C. Pretended　　 D. admitted

9.A. Take　　　　　　 B. Quit　　　　　　 C. Reserve　　　 D. change

10.A. Behind　　　　 B. Beneath　　　　 C. Beside　　　　 D. before

11.A. Mental　　　　 B. Intellectual C. Technical　　 D. environmental

12.A. narrow　　　　 B. Dark　　　　　　 C. Long　　　　　 D. roundabout

13.A. Unluckily　　 B. Oddly　　　　　 C. Nervously　　 D. Disappointingly

14.A. Gloves　　　　 B. Pockets　　　　 C. air　　　　　　 D. seat

15.A. Vague　　　　　 B. Strange　　　　 C. Boring　　　　 D. rough

16.A. Confused　　　　 B. Astonished　　　　 C. Annoyed　　　　 D. terrified

17.A. Life　　　　　　　　 B. Entertainment　 C. Dream　　　　　　 D. ride

18.A. Social　　　　　　 B. Unexpected　　　　 C. Serious　　　　 D. general

19.A. Uncertain　　　　 B. Uncomfortable　　 C. Challenging　 D. exciting

20.A. Evaluate　　　　 B. complete　　　　　　 C . adore　　　　 D. Enjoy

高三英语完形填空中等难度题查看答案及解析

Try the new cleaner．Just a few minutes every day—that’s all it takes—______you could have shining floors and furniture．

高三英语单项填空简单题查看答案及解析

Try the new cleaner. Just a few minutes every day－that’s all it takes－_________ you could have shining floors and furniture.

A. but              B. and           C. or           D. so

高三英语单项填空中等难度题查看答案及解析

Try the new cleaner. Just a few minutes every day－that’s all it takes－_________ you could have shining floors and furniture.

高三英语单项填空简单题查看答案及解析