Sitting too much is linked to changes in a se...

Sitting too much is linked to changes in a section of the brain that is important for memory, according to a recent study by UCLA researchers of middle-aged and older adults.

Studies show that too much sitting, like smoking, increases the risk of heart disease, diabetes and premature death. Researchers at UCLA want to see how sedentary behavior (sitting for long periods of time) influences the health of the brain, especially regions of the brain that are important to memory formation.

UCLA researchers gathered 35 people aged 45 to 75 and asked about their physical activity levels and the average number of hours per day they spent sitting over the previous work. Each person had a high-resolution MRI (热分辨磁共振成像)scan, which provides a detailed look at the medial temporal lobe, or MTL, a bruin region involved in the formation of new memories.

The researchers found that sedentary behavior is an important predictor of thinning of the MTL and that physical activity, even at high levels, is mil enough to compensate the harmful effects of silting for long periods.

“This study does not prove that too much sitting causes thinner brain structures, but instead that more hours spent sitting are associated with thinner regions,” researchers said. In addition, the researchers focused on the hours spent sitting, but did not ask participants if they took breaks during this time.

The researchers next hope to follow a group of people for a longer duration to determine if sitting cause the tinning and what role gender (性別), race, and weight might play in bruin health related to silting.

“MTL thinning can be an indication of cognitive (认知的) decline in middle-aged and older adults. Reducing sedentary behavior may be a possible target for measures designed to improve bruin health in people at risk for Alzheimer’s disease,” researchers said.

1.What is the study done by UCLA mainly intended to find out?

A. What harm sitting too much causes.

B. Why silting too much is like smoking.

C. How too much sitting affects brain health.

D. Whether too much sitting causes early death

2.Participants were scanned by a high-resolution MRI to 　　 .

A. evaluate their memory loss

B. examine their MTL conditions

C. record their physical activity levels

D. record the length of lime for their sitting

3.What do UCLA researchers think of their study?

A. It in a great success.

B. It is little practical value.

C. It must target the young.

D. It still needs to be improved.

4.What can be the best title for the text?

A. Long Sitting Is Bad for Your Brain

B. How to Improve Brain Health

C. Sitting Causes Many Health Problem

D. An Easy Way to Prevent Memory Loss

高二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 video games 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 losingsays 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 planted 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 wander 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 partly 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.couch potatoes were affected by long-time sitting.

B.watching TV is related with increased death risk.

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 study？ how can people reduce the risk of death when watching TV？___

A.By increasing simple movement.

B.By totally avoiding watching TV.

C.By taking some medicine.

D.By doing sweaty type of exercise.

高二英语阅读理解中等难度题查看答案及解析

Is there link between humans and climate change or not? This question was first studied in the early 1900s. Since then, many scientists have thought that our actions do make a difference. In 1997, the Kyoto Protocol explained our role in the Earth’s changing atmosphere and set international limits for gas emissions（排放）from 2008 to 2012. Some countries have decided to continue these reductions until 2020. More recently, the Paris Agreement, stuck by nearly 200 countries, also aims to limit global warming. But just now how much warmer it will get depends on how deeply countries cut carbon emissions.

3.5℃: This is how much temperatures would rise by 2100 even if nations live up to the initial Paris promises to reduce carbon emissions; this rise could still put coastal cities under water and drive over half of all species to extinction.

2℃: To meet this minimum goal, the Agreement requires countries to tighten emissions targets every five years. Even this increase could sink some islands, worse drought and drive a decline of up to a third in the number of species.

1.5℃: This is the most ambitious goal for temperature rise set by the Paris Agreement, after a push by low-lying island nations like Kiribati, which say limiting temperature rise to 1.5℃ could save them from sinking.

0.8℃: This is how much temperatures have risen since the industrial age began, putting us 40% of the way to the 2℃ point.

0℃: The baseline here is average global temperature before the start of the industrial age.

1.It can be concluded from Para.1 that _______.

A. the problem of global warming will have been quite solved by 2020

B. gas emissions have been effectively reduced in developed countries

C. the Paris Agreements is more influential than the Kyoto Protocol

D. humans have made continuous efforts to slow down global warming

2.If nations could only keep the initial promises of the Paris Agreement, what would happen by the year 2100?

A. The human population would increase by one third.

B. Little over 50% of all species would still exist.

C. The Agreement’s minimum goal would not be reached.

D. Nations would not need to tighten their emissions targets.

3.If those island nations not far above sea level are to survive, the maximum temperature rise, since the start of the industrial age, should be_______.

A. 0.8℃　　 B. 1.5℃　　 C. 2℃　　 D. 3.5℃

高二英语阅读理解中等难度题查看答案及解析

The table ____ too much room. Let’s move it out of the sitting room.

高二英语单项填空中等难度题查看答案及解析

Stress is one of the most common causes of health problems in modern life. Too much stress results in physical, emotional, and mental health problems.

There are numerous physical effects of stress. Stress can affect the heart. It can increase the pulse rate, make the heart miss beats, and can cause high blood pressure. Stress can affect the respiratory (呼吸的) system. It can lead to asthma and cause a person to breathe too fast, resulting in a loss of important carbon dioxide. Stress can affect the stomach. It can cause stomachaches and problems of digesting food. These are only a few examples of the wide range of illnesses and symptoms resulting from stress.

Emotions are also easily affected by stress. People suffering from stress often feel anxious. They may have panic attacks and feel tired all the time. When people are under stress, they often overreact to little problems. For example, a normally gentle parent under a lot of stress at work may yell at a child for dropping a glass of juice. Stress can make people angry, moody, or nervous.

Long-term stress can lead to a variety of serious mental illnesses. Depression, an extreme feeling of sadness and hopelessness, can be the result of continued and increasing stress. Alcoholism and other addictions often develop as a result of overuse of alcohol or drugs to try to relieve（释放）stress. If stress is allowed to continue, then one’s mental health is put at risk.

It is obvious that stress is a serious problem. It attacks the body. It affects the emotions. Untreated, it may eventually result in mental illness. Stress has a great influence on the health, our feelings and our minds. So, reduce stress: stop the world and rest for a while.

1.What physical effects does stress result in?

A.Overreacting to little problems.

B.Making blood pressure low.

C.Suffering from depression.

D.Increasing the pulse rate.

2.Which one belongs to the emotional problem?

A.Alcohol abuse.

B.Drug addiction.

C.MuchAnxiety.

D.Heartbeat missing.

3.What does the fourth paragraph mainly talk about?

A.Stress causing mental problems.

B.Stress causing physical problems.

C.Stress causing emotional problems.

D.Stress causing panic attacks.

高二英语阅读理解中等难度题查看答案及解析

I cannot hear the professor clearly as there is too much noise _____ I am sitting.

A. that            B. where            C. who                D. what

高二英语单项填空中等难度题查看答案及解析

_____ to too much sunlight, as is generally considered, will add to the potential of catching skin cancer.

A. Being exposed          B. Exposed                 C. Exposing               D. To expose

高二英语单项填空中等难度题查看答案及解析

We _____ estimate the spirit of the Shanghai Expo too much, which is sure to play an important role in our daily life.

A. may not      B. should not     C. must not       D. cannot

高二英语单项填空困难题查看答案及解析

The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.

A. limit           B. lack         C. need           D. demand

高二英语单项填空中等难度题查看答案及解析

The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.

A. limit           B. lack         C. need           D. demand

高二英语单项填空中等难度题查看答案及解析