I don’t smoke now, but I _______ for more than twenty years.
A. smoked B. was smoking C. have smoked D. had smoked
高三英语单项填空中等难度题
I don’t smoke now, but I _______ for more than twenty years.
A. smoked B. was smoking C. have smoked D. had smoked
高三英语单项填空中等难度题查看答案及解析
Peter doesn’t smoke now, but he ________ for almost twenty years.
A. was smoking B. had smoked C. has smoked D. smoked
高三英语单项填空中等难度题查看答案及解析
Jack doesn’t smoke now, but he _______ for almost twenty years.
A．was smoking B．had smoked C．has smoked D．smoked
高三英语单项填空中等难度题查看答案及解析
I don’t smoke now, but I ____for almost ten years.
A. ever smoked B. have ever smoked C. had ever smoked D. was ever smoking
高三英语单项填空中等难度题查看答案及解析
I don’t smoke now, but I ______ for almost ten years．
A．ever smoked B．have ever smoked
C．had ever smoked D．was ever smoking
高三英语单项填空困难题查看答案及解析
For more than twenty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive to such messages.
Scientists are using powerful radio telescope to listen to signals from about 1,000 stars, all within 100 light years of earth. In addition, they will scan (扫视) the entire sky to “listen” for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal that stands out from the background noise.
Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent are like our sun. Perhaps half of them have a planet like earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution (进化) of life. Based on the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.
However, many scientists wonder whether intelligent life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
Other scientists believe that our search hasn’t been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family in only about five billion years old, our galaxy is about 20 billions years old. In that time, some scientists think it is likely that civilizations are much more advanced than ours. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.
1.According to the passage, how many planets in our galaxy might be inhabitable?
A. 15 billion. B. 10 billion.
C. 5 billion D. 200 billion
2.The first paragraph in this passage is mainly about ________.
A. why scientists are looking for signs of life on other planets
B. how scientists are looking for signs of life on other planets
C. where scientists are looking for signs of life on other planets
D. when scientists are looking for signs of life on other planets
3.The underlined word “monitor” in the passage means “________”.
A. find B. follow
C. form D. check
4.Which of these statements is True based on the information in the passage?
A. Scientists are tying different ways to find signs of life on other planets.
B. Most scientists believe that there is intelligent life on other planets.
C. The earth is one of the oldest planets in our galaxy.
D. Scientists don’t believe that there might be life on other planets.
高三英语阅读理解中等难度题查看答案及解析
For more than twenty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive to such messages.
Scientists are using powerful radio telescope to listen to signals from about 1,000 stars, all within 100 light years of earth. In addition, they will scan (扫视) the entire sky to “listen” for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal that stands out from the background noise.
Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent are like our sun. Perhaps half of them have a planet like earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution (进化) of life. Based on the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.
However, many scientists wonder whether intelligent life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
Other scientists believe that our search hasn’t been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family in only about five billion years old, our galaxy is about 20 billions years old. In that time, some scientists think it is likely that civilizations are much more advanced than ours. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.
1.According to the passage, how many planets in our galaxy might be inhabitable?
A.15 billion. B.10 billion.
C.5 billion. D.200 billion
2.The first paragraph in this passage is mainly about ________.
A.why scientists are looking for signs of life on other planets
B.how scientists are looking for signs of life on other planets
C.where scientists are looking for signs of life on other planets
D.when scientists are looking for signs of life on other planets
3.The underlined word “monitor” in the passage means “________”.
A.find B.follow
C.form D.check
4.Which of these statements is True based on the information in the passage?
A.Scientists are tying different ways to find signs of life on other planets.
B.Most scientists believe that there is intelligent life on other planets.
C.The earth is one of the oldest planets in our galaxy.
D.Scientists don’t believe that there might be life on other planets.
高三英语阅读理解中等难度题查看答案及解析
（重庆一中2016届高三5月模拟）For more than twenty years scientists have been searching for signs of life on other planets. Most of these searches have been done over the radio. The hope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceships traveling through space, on the chance that someone may be receptive to such messages.
Scientists are using powerful radio telescopes to listen to signals from about 1, 000 stars, all within 100 light years of earth. In addition, they will scan the entire sky to “listen” for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal they stands out from the background noise.
Of the 200 billion stars in the Milky Way galaxy, scientists find that five percent are like our sun. Perhaps half of them have a planet like earth. Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution of life. Based on the inhabitable（that can be lived in）planets in our galaxy, most scientists agree that chances are likely that one or more of these planets support some life.
However, many scientists wonder whether intelligent life exists on other planets. Some believe that twenty years of searching without any intelligible messages shows that no one is out there. They say that the evolution of intelligence comparable to ours is unlikely.
Other scientists believe that our search hasn’t been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family is only about five billion years old, our galaxy is about 20 billion years old. In that time, some scientists think it is likely that civilization much more advanced than ours have developed. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.
1.According to the passage, how many planets in our galaxy might be inhabitable?
A. 5 billion． B. 10 billion.
C. 15 billion. D. 200 billion
2.The first paragraph in this passage is mainly about ________ .
A. how scientists are looking for signs of life on other planets
B. why scientists are looking for signs of life on other planets
C. where scientists are looking for signs of life on other planets
D. when scientists are looking for signs of life on other planets
3.The underlined word “monitor” in the passage means“ ________ ”.
A. find B. imitate
C. check D. form
4.Which of these statements is true based on the information in the passage?
A. The earth is one of the oldest planets in our galaxy.
B. Most scientists believe that there is intelligent life on other planets.
C. Scientists are trying different ways to find signs of life on other planets.
D. Scientists don’t believe that there might be life on other planets.
高三英语阅读理解中等难度题查看答案及解析
.-- His father is a professor and has been teaching in the university for more than twenty years.
-- _____.
| A．So is his mother | B．So has his mother |
| C．So his mother does | D．So it is with his mother |
高三英语单项填空简单题查看答案及解析
Unhealthy diets are responsible for preventable deaths globally per year, more even than smoking tobacco, according to a major study.
“But the biggest problem is not the junk we eat but the nutritious food we don’t eat,” say researchers, calling for a global shift in policy to promote vegetables, fruit, nuts and beans. While sugar and trans-fats are harmful, more deaths are caused by the absence of healthy foods in our diet. Heart attacks are the main diet-related causes of death, followed by cancers and diabetes (糖尿病).
The study found that eating and drinking better could prevent one in five deaths around the world. “Rather than trying to persuade people to cut down on sugar, salt and fat, which has been the main focus of diet policy debate in the past two decades, it would be better to promote healthy options. Adoption of diets emphasizing beans and other healthy plant sources of protein, for instance, will have important benefits for human health,” note the researchers.
The study is the most comprehensive analysis on the health effects of diet ever conducted. It looked at 15 different nutrients, giving detailed knowledge of the analysis and summary of the risk factors of them.
Tom Sanders, a professor of nutrition and dietetics (饮食学), said the analysis put too much emphasis on individual components rather than the overall diet. “Overweight is a major driver for risk of diabetes as well as cancer and the health evidence for this relationship is strong. Overweight is caused by eating more food energy than required rather than specific dietary components such as sugar. The trend for populations to sit too much is a major reason why there is an imbalance between energy intake and consumption but Increased availability of foods with high calories makes it too easy to overeat.”
1.What do the researchers think is the best way to lower preventable death rate?
A.Restricting junk food. B.Trying to eat healthily.
C.Avoiding risk factors. D.Adopting high-calorie diets.
2.What’s the major concern of the current diet policy?
A.The diversity of food.
B.The importance of nutritious food.
C.The reduction of unhealthy food intake.
D.The balance between diet and exercise.
3.Which of the following does Tom Sanders agree with?
A.The analysis overlooks dietary integrity.
B.Overweight results from diabetes and cancer.
C.People who rarely exercise must diet strictly.
D.Particular dietary components lead to overweight.
4.Where is the text most likely from?
A.A product brochure. B.A cookbook.
C.A medical textbook. D.A health journal.
高三英语阅读理解中等难度题查看答案及解析