The impact of Einstein’s breakthrough in the field of photoelectric effect ____ the understanding of the universe was simply tremendous.
A. in B. on C. with D. about
高二英语单项填空中等难度题
The impact of Einstein’s breakthrough in the field of photoelectric effect ____ the understanding of the universe was simply tremendous.
A. in B. on C. with D. about
高二英语单项填空中等难度题查看答案及解析
With the successful launch of Tiangong-I, which was ______ breakthrough in space field, China's space dream took a step closer to ______ reality.
A. a; / B. the; a C. a; the D. the; /
高二英语单项填空中等难度题查看答案及解析
Only in 1996 the determination and patience of the scientists with a breakthrough at last .
A. were ; paid off B. did; pay back C. did ; pay off D. did ; pay for
高二英语单项填空简单题查看答案及解析
At last the determination and patience of the scientists _______in 1996 with a breakthrough -------- the cloning of Dolly the sheep.
A. paid off B. paid out C. paid back D. paid up
高二英语单项填空简单题查看答案及解析
Although the doctor is claiming a major breakthrough in the fight against cancer, I am of his chances of curing the patients.
A. specific B. sceptical C. stable D. sincere
高二英语单项填空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
In 1905, as part of his Special Theory of Relativity, Albert Einstein published the point that a large amount of energy could be released from a small amount of matter. This was expressed by equation E = me 2(energy = mass times the speed of light squared). But bombs were not what Einstein had in mind when he published this equation.
In 1929, he publicly declared that if a war broke out he would “refused to do war service, direct or indirect…” His position would change in 1933, as the result of Adolf Hitler’s coming into power in Germany.
Einstein’s greatest role in the invention of the atomic bomb was signing a letter to President Franklin Roosevelt urging that the bomb be built because some physicists feared that Germany might be working on an atomic bomb. Among those concerned were physicists Leo Szilard and Eugene Wigner. But Szilard and Wigner had no influence with those in power. So in July 1939 they explained the problem to someone who did: Albert Einstein. After talking with Einstein, in August 1939 Szilard wrote a letter to President Roosevelt with Einstein’s signature on it, which was delivered to Roosevelt in October 1939.
Germany has invaded Poland the previous month; the time was ripe for action. That October research of a-bomb began but proceeded slowly because the invention of the atomic bomb seemed distant and unlikely. In April 1940 an Einstein letter, ghost-written by Szilard, pressed the researchers on the need for “greater speed”.
As the realization of nuclear weapons grew near, Einstein looked beyond the current war to future problems that such weapons could bring. He wrote to his friend about his fear about the future use of the a-bomb.
The atomic bombings of Japan occurred three months after Germany gave in.
In November 1954, five months before his death, Einstein summarized his feelings about his role in the creation of the atomic bomb: “I made one great mistake in my life… when I signed a letter to President Roosevelt recommending that atom bombs be made; but there was some justification---- the danger that the Germans would make them”.
1.What can we learn about Szilard and Wigner?
A. They were not as influential as Einstein.
B. They were responsible for the invention of nuclear weapons
C. They had cheated their friend Albert Einstein.
D. They had an intention to destroy the world.
2. Einstein realized his mistake of ___________.
A. co-operating with his workmates
B. inventing the atomic bomb
C. publishing his equation
D. signing the letter to President Roosevelt
3. We can conclude that Einstein ___________.
A. was important in the development of atomic bomb
B. was not involved in the invention of atomic bomb
C. directly participated in the invention of the atomic bomb
D. helped with the invention of atomic bomb
4. Why did Einstein suggest making atom bombs?
A. Because President Roosevelt asked to do so.
B. Because it was likely that Hitler would make them.
C. Because it was not in favor of President Roosevelt.
D. Because it was not necessary to do so.
5.The best title for the passage would be __________.
A. A Story of Albert Einstein
B. Albert Einstein and the Atomic Bomb
C. It was Unfair for Einstein
D. How the Atomic Bomb was Invented
高二英语阅读理解中等难度题查看答案及解析
Albert Einstein said, "In the middle of every difficulty lies opportunity. Once______, such opportunities are like ____diamonds hidden in the sand.
Several years ago I spoke at church about how we are surrounded by "_______" if we could only______them. A man stopped by to______me. I remembered him______somebody who had______through a painful divorce and was examining his life's priorities (优先). He put out his hand which______a small, plastic gem stone.
"I stepped on this gem stone______I was leaving church last Sunday," he explained.
"It became ______ in the sole(底) of my shoe. You had spoken about recognizing______---- diamonds.I put the plastic stone in my pocket to_______me to look for those diamonds that I need."
"I have been trying to______my business," he continued. "On Monday morning, a man stopped by______seemed interested in______some of my goods in stock. I thought, here's my diamond ---- don't let it______! I sold the entire stock to him by noon."
"Now," he said through a______smile, "my next diamond is to find a new______!"
Not long afterward, he did find a new ---- and better ---- job. He decided to______his gem stone with him from then on as a reminder to look for diamonds as he digs through the______of life.
1.A. realized B. gone C. discovered D. lost
2.A. valuable B. cheap C. expensive D. rejected
3.A. challenges B. flowers C. friends D. diamonds
4.A. pick B. recognize C. meet D. control
5.A. see B. greet C. help D. call
6.A. on B. for C. with D. as
7.A. pushed B. suffered C. moved D. looked
8.A. contained B. grasped C. threw D. covered
9.A. after B. before C. when D. since
10.A. broken B. tied C. stuck D. hidden
11.A. differences B. opportunities C. facts D. truths
12.A. force B. inform C. warn D. remind
13.A. sell B. start C. close D. Improve
14.A. which B. who C. he D. me
15.A. accepting B. taking C. buying D. joining
16.A. go out B. go up C. go down D. go away
17.A. broad B. shy C. secret D. go away
18.A. business B. home C. wife D. job
19.A. own B. keep C. return D. lend
20.A. meanings B. pleasures C. difficulties D. possibilities
高二英语完形填空中等难度题查看答案及解析
Only those, as Albert Einstein once said in one of his famous books, ______ attempt the absurd can achieve the impossible.
A. who B. which
C. whose D. where
高二英语单项填空中等难度题查看答案及解析
The last decade of the 20th century ___ the rapid, steady development of China in various fields.
A.was witnesses B.is witnessed C.had witnessed D.witnessed
高二英语单项填空简单题查看答案及解析