these trials, people are assigned to a treatment group, which benefits from the project, and a control group, which does not.A. initially B. conventionallyC. superbly D. randomly 题目和参考答案——青夏教育精英家教网—

题目内容

these trials, people are ________assigned to a "treatment" group, which benefits from the project, and a "control" group, which does not.

A. initially B. conventionally

C. superbly D. randomly

练习册系列答案

相关题目

Time Travel

If you could travel in time, where would you go? Perhaps you would watch an originalperformance of a Shakespeare’s play in Elizabethan England?

What about hanging out with Laozi in the Spring and Autumn Period? Or maybe you’d voyage far ahead of the present day to see what the future holds.

The possibility of time travel is indeed appealing. Stories exploring the subject have been around for hundreds of years. Perhaps the best known example is science fiction novel The Time Machine, which was written by H.G.Wells and published in 1895 for the first time. It was adapted into at least two feature films of the same name, as well as two television versions, and a large number of comic book adaptations. It is generally credited with the popularization of the concept of time travel using a vehicle that allows an operator to travel purposefully and selectively. The term “time machine”, coined by

Wells, is now universally used to refer to a vehicle transporting people into the far future.

But could time travel actually be possible? Some scientists say yes, in theroy. They propose using cracks in time and space called“wormholes”,which could be used as shortcuts to other periods．Einstein's theory of relativity allows time travel in extreme circumstances．And British physicist Stephen Hawking says you could travel into the future with a really fast spaceship—going at nearly the speed of light．Though building such a spaceship would of course be no simple task．

Even if you could travel into the past, there is something called the “grandfather paradox”．It asks what would happen if a time traveler were to go back in time and have his own grandfather killed for some reason, and therefore prevent himself from being born．If the time traveler wasn't born, how would he travel back in time？

And would you really like to visit the future？In H．G．Wells' book,the main character travels into distant time where he arrives at a beach and is attacked by giant crabs．He then voyages 30 million years into the future where the only living thing is a black object with tentacles（触角）.

If that's what's in store, maybe we are better just living in the present day after all．

1.The novel The Time Machine mentioned in Paragraph 2 aims to show___________．

A．People's interest in time travel

B．the special feature of the book

C．the long history of time travel

D．the contribution of H．G．Wells

2.Einstein's and Hawking's theories_________．

A．have similarities in many ways

B．push the invention of the first spaceship

C．have proved wrong by some time travelers

D．suggest the possibility to invent the time machine

3.In Paragraph 4,“grandfather paradox”probably refers to the idea that__________．

A．the traveler is prevented from meeting his grandfather

B．the traveler goes back in time to seek for his grandfather

C．the grandfather's death makes the traveler's birth impossible

D．The reunion of the traveler and his grandfather brings happiness

4.According to the passage, what is probably the author's attitude towards time travel？

A．Unclear． B．Skeptical．

C．Supportive．D．Unconcerned．

_____ is even important _____ as the earth cooled down, water began to appear on its surface.

A. That, which B. What, that

C. What, what D. It, that

阅读下面材料，在空白处填入适当的内容（不多于3个词）或括号内单词的正确形式，并把答案写在答题卡上的相应位置。

Louis invited his friends to lunch one day. He was cooking some delicious food in the kitchen. Suddenly, he 1. (find) that he had run out of salt. So Louis called to his son, “Go to the village and buy some salt, but pay a fair price for it: neither too much 2. too little.”

His son looked surprised. “I can understand why I shouldn’t pay too much, Father, but if I can pay less, 3. not save a bit of money?”

“That would be a very 4. (reason) thing to do in a big city, but it could destroy a small village like ours,” Louis said.

Louis’s guests, 5. had heard their conversation, asked why they should not buy sale more cheaply if they could. Louis replied, “The only reason why a man would sell sale 6. a lower price would be that he was desperate for money. And anyone who took advantage of that situation would be showing a lack of respect for the sweat and struggle of the man who worked very hard to produce 7. .”

“But such a small thing couldn’t 8. (possible) destroy a village.”

“In the beginning, there was only 9. very small amount of unfairness in the world, but everyone added a little, always 10. (think) that it was only small and not very important, and look where we have ended up today.”

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Do you have a spare room in your house? Do you like to share your driveway in front of your garage with others? 1. Many people are benefiting from this new business of renting.

Perhaps the best-known example of a company in this field is Airbnb—an American web business which allows you to rent out your spare room to holidaymakers. It says it operates in 34,000 cities and it has 800,000 listings of rooms and apartments. 2.

A British company is doing something with parking spaces. Just Park’s founder，Anthony Eskinazi, says, “When I had the original idea. I spotted a driveway close to a spots stadium. It would have been so convenient if I could have just parked in that driveway rather than in a commercial car park.” 3. Around 20,000 people have advertised their spaces on the website, and he says around half a million drivers use it.

4. They are people who run things like traditional hotels and commercial car parks. They are afraid of ending up losing money.

5. Regulations for these new businesses are unclear. How will renting out your driveway affect your neighbor? Because this is a new business world, those rules aren’t there yet.

A. They seem to have occupied the majority of the market.

B. Both of these can help you make money.

C. And there is another problem.

D. And his great idea has proved a success.

E. But the new business of renting has its competitors.

F. There are many ways to earn money.

G. A commercial car park is inconvenient.

短文改错（共10小题，每小题1分，满分10分）

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处错误，

句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（^），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分。

My dream school starts at 8:30 a.m and ends at 3:30 p.m. They are three lessons in the morning and two in the afternoon. We didn’t need to do so many homework. Therefore , we have more time with after-school activities. For example, we can do reading for one and a half hour and play sport for one hour every day.

My dream school look like a big garden. There are all kinds of the flowers and trees around the classroom buildings. We can lie on the grass for a rest, or sat by the lake listening music. The teachers here are kind and helpfully. They are not only our teachers but also our friends.

A concert was given to several famous singers last Saturday. Tickets were very hardly to get. Since I wanted to attend that concert, I bought one at the high price. For the first half an hour, the concert went on smooth. The nice shows of the singers were warmly welcomed by the audience, many of them couldn’t help burst into tears. Before long the microphone went wrong. Some people begin to make noise. The members of the theatre tried to keep in order, but failed. He had difficulty in continuing the concert. Thus, a perfectly good concert caused to be of no value by some uneducated people.

I _________ returning to the train station and spending the rest of the day in the waiting room. Life is no fun without a companion to share it with.

A. ended up B. took up C. led to D. stick to

—Is the project difficult for the students?

—No. Most of the relevant information ______ to them.

A. has been provided B. has provided

C. had been provided D. had provided

试题分类