The findings of the research, _________ on a ...

The findings of the research, _________ on a lot of experiments, are convincing.

A. to base      B. based      C. is based      D. basing

高二英语单项填空简单题查看答案及解析

The professor’s research finally proved to be ______, though he had spent a lot of money on it.

A. priceless                B. valuable                 C. worthless              D. worthwhile

高二英语单项填空简单题查看答案及解析

Lots of people find it hard to get up in the morning, and put the blame on the alarm clock. In fact, the key to easy morning wake-up lies in resetting your body clock. 1. Here’s how to make one.

● 2. In order to make a change, you need to decide why It’s important. Do you want to get up in time to have breakfast with your family, get in some exercise，or just be better prepared for your day! Once you are clear about your reasons, tell your family or roommates about the change you want to make.

● Rethink mornings. Now that you know why you want to wake up, consider re-arranging your morning activities. If you want time to have breakfast with your family, save some time the night before by setting out clothes, shoes，and bags. 3. That’s a quarter-hour more you could be sleeping if you bought a coffee maker with a timer.

● Keep your sleep/wake schedule on weekends. If you’re tired out by Friday night, sleeping in on Saturday could sound wonderful. But compensating on the weekends actually feeds into your sleepiness the following week, a recent study found. 4.

● Keep a record and evaluate it weekly. Keep track of your efforts and write down how you feel. After you’ve tried a new method for a week, take a look at your record.5. If not, take another look at other methods you could try.

A. Get a sleep specialist.

B. Find the right motivation.

C. A better plan for sleep can help.

D. And consider setting a second alarm.

E. If the steps you take are working, keep it up.

F. Stick to your set bedtime and wake-up time, no matter the day.

G. Reconsider the 15 minutes you spend in line at the cafe to get coffee.

高二英语七选五中等难度题查看答案及解析

Scientists _______ a lot of experiments on animals, hoping to find and effective way to cure the patients who had AIDS.

高二英语单项填空中等难度题查看答案及解析

________the difference between the two research findings will be one of the worst mistakes you make.

A. Ignore　　 B. Ignoring

C. Ignored　　 D. Having ignored

高二英语单项填空中等难度题查看答案及解析

Recent research findings have ________ the origin of our universe, which has puzzled the scientific world.

A. cast light on　　 B. given rise to

C. seized control of　　 D. kept company with

高二英语单项填空中等难度题查看答案及解析

Researchers find that1.large amount of African dust can blow all the way across the Atlantic Ocean and fall on North and South Americas.

African dust storms can harm air quality2. the ocean. But new research by scientists from some countries 3. (show) the storms also can do some good. 4.is found that an average of 28 million metric tons of Saharan dust falls in South America’s Amazon River basin each year. Scientists say the dust is an important5.(provide) of fertilizer. “Yes, it’s6.(surprise) because of the huge amount of dust and phosphorous(磷), 7. is a nutrient that plants need8.(grow),” one of them says.

In fact, the phosphorous9.(fall) from the sky is about the same as the amount that rivers carry out each year. The thick rainforest and the desert dust 10.(join) together on one small planet.

高二英语短文填空中等难度题查看答案及解析

If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that most of our brains are not getting enough exercise—and as a result, we are aging unnecessarily soon.

Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of aging could be slowed down.

With a team of colleagues at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages and varying occupations.

Computer technology enabled the researchers to obtain precise measurements of the volume of the front and side sections of the brain, which relate to intellect (智能) and emotion, and determine the human character. (The rear section of the brain, which controls functions like eating and breathing, does not contract with age, and one can continue living without intellectual or emotional faculties.)

Contraction of front and side parts—as cells die off—was observed in some subjects in their thirties, but it was still not evident in some sixty- and seventy-year-olds.

Matsuzawa concluded from his tests that there is a simple remedy to the contraction normally associated with age—using the head.　 The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Matsuzawa, are lawyers, followed by university professors and doctors. White collar workers doing routine work in government offices are, however, as likely to have shrinking brains as the farm worker, bus driver and shop assistant.　　 Matsuzawa’s findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain cells need. “The best way to maintain good blood circulation is through using the brain,” he says, “Think hard and engage in conversation. Don’t rely on pocket calculators.”

1.The team of doctors wanted to find out ________.

why certain people age sooner than others　　

B. how to make people live longer

C. the size of certain people’s brains　　　　　

D. which people are most intelligent

2.On what are their research findings based?

A survey of farmers in northern Japan.　　　　　

B. Tests performed on a thousand old people.

C. The study of brain volumes of different people　

D. The latest development of computer technology.

3.The word “subjects” in Paragraph 5 means ________.

something to be considered　　　　　　　　　　　　

B. branches of knowledge studied

C. persons chosen to be studied in an experiment　　

D. any member of a state except the supreme ruler.

4.According to the passage, which people seem to age slower than the others?

A. Lawyers.　　　　 B. Farmers.　　

C. Clerks.　　　　 D. Shop assistants.

高二英语阅读理解中等难度题查看答案及解析

Are you a morning person? You might not like the findings in this new research.

From a lack of air and drinking water to solar radiation, theoretical Mars pioneers face any number of potential obstacles to settling on the red planet. Now, scientists have found something else to add to the list: seriously messed-up biological clocks.

One day on Mars - which scientists refer to as the solar day, or“sol”- is 37 minutes longer than a day on Earth. A team of European scientists recently demonstrated why that could be a problem.

Circadian rhythms are the body’s natural cycles of rest and waking, which tend to follow roughly 24-hour light-dark cycles. These natural rhythms - which play a role in biological functions including brain wave activity and hormone production - can be interrupted by things like jet lag（时差）and night shift work.

For the study, the researchers compared mice with healthy, 24-hour circadian clocks to mice with a genetic change that caused them to have shorter, 20-hour circadian clocks. The mice with healthy biological clocks were more likely to survive and reproduce, while the mice with shorter biological clocks were more likely to die off.

What does this all have to do with space travel? Since the Martian sol is longer than a day on Earth, people with shorter circadian clocks could suffer from health problems as they try to adapt to the rotational speed of the red planet.

Unfortunately, the body is unlikely to adapt to the new conditions or“learn”to develop a longer clock. As Loudon explained,“Learning is not a likely option.”

In other words: Sorry, super-early risers - NASA might not want you for the next Mars mission.

1.From the passage, people can face the following troubles living on Mars EXCEPT ______.

A. absence of air　　 B. a lot of fierce creatures

C. lack of drinking water　　 D. messed-up biological clocks

2.According to scientists, how long does one day on Mars last?

A. 24 hours.　　 B. 23 hours and 23 minutes.

C. 24 hours and 37 minutes.　　 D. 12 hours and 37 minutes.

3.How did the researchers study what effect living on Mars has on sleep?

A. By comparing different mice.　　 B. By analyzing computer data.

C. By experiments in spaceships.　　 D. By observing and judging.

4.Life on Mars would seriously mess with your sleep because ________.

A. the brain wave activity will be interrupted

B. the body’s natural cycles can be shortened

C. hormone production will hurt biological functions

D. the Martian sol is longer than a day on Earth

高二英语阅读理解中等难度题查看答案及解析

Researchers have announced the result of two studies on the health effects of the drug aspirin．One study shows aspirin can sharply reduce the chance that a healthy, older man will suffer from a heart attack．

The study offered two new results from earlier findings, It said taking one aspirin pili every other day helped only healthy men over the age of fifty．It also said aspirin gave the greatest protection against heart attacks to men with low blood cholesterol（胆固醇）levels．

Earlier in the United States began a major aspirin study in the early 1980s．It included 22,000 healthy men doctors．Ail were between the ages of forty and eighty-four．More than 11,000 of the doctors took a harmless pill that contained no drug．The men did not know which kind of pill they were taking．

The doctors who took aspirin suffered 44% fewer heart attacks than those taking the harmless pill．139 men who took aspirin suffered from heart attacks．Ten of them died．239 men who did not take aspirin suffered from heart attacks．Twenty-six of them died．

The researchers said the doctors' study provides clear proof that taking aspirin can prevent a first heart attack in healthy, older men．They said, however, the result does not mean every man over the mage of fifty should take aspirin．They said aspirin couldn't help men who do not eat healthy foods, who smoke cigarettes and who are fat．The researchers said men who think they wou3d be helped by taking aspirin should talk with their doctors first．

1.We may learn that the new use of aspirin is ______．

2.Aspirin can help those who ______．

3.At last the researchers advised us to take aspirin _____.

4.From the experiment we can conclude that about ______ of people who suffered from heart attacks without aspirin died．

高二英语阅读理解困难题查看答案及解析