题干

   Space is where our future is—trips to the Moon, Mars and beyond. Most people would think that aside from comets (彗星) and stars, there was little else out there. But, since our space journey started we have left so much trash there that scientists are now concerned that if we don’t clean it up, we may all be in mortal (致命的) danger.

The first piece of space junk was created in 1964, when the American satellite Vanguard 1 stopped operating and lost its connection with the ground center. However, since it kept orbiting around the Earth without any consequences, scientists became increasingly comfortable abandoning things that no longer served any useful purpose in space.

It is estimated that there are now over millions of pieces of man-made trash orbiting the Earth at high speed. The junk varies from tiny pieces of paint chipped off rockets to cameras, huge fuel tanks, and even odd items like the million-dollar tool kit that astronaut Heidemarie Stefanyshyn-Piper lost during a spacewalk.

The major problem with the space trash is that it may hit working satellites and damage traveling spacecraft. Moreover, pieces of junk may collide (碰撞) with each other and break into pieces which fall back to the Earth. To avoid this, scientists have invented several ways of clearing the sky. Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles. Future plans include a cooperative effort among many nations to stop littering in space and to clean up the trash already there.

【小题1】What was the first piece of man-made space trash?
A.A camera.B.A tool kit.
C.A broken satellite.D.A fuel tank.
【小题2】Why were scientists NOT concerned about space trash in the beginning?
A.It did not cause any problems.
B.It no longer served any useful purpose.
C.It was millions of miles away from the Earth.
D.It was regarded as similar to comets and stars.
【小题3】What can be learned about space junk?
A.It is huge, heavy machines.
B.It may cause problems for space shuttles.
C.It floats slowly around the Earth.
D.It never changes positions.
【小题4】What has been done to the space trash problem?
A.Ground stations are built to help store the trash properly in space.
B.Many nations have worked together to stop polluting space.
C.Larger pieces of space trash are being closely watched.
D.Scientists have cleaned up most of the trash.
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同类题1

   A lot of people say math is not their strong suit. One New Jersey parent wants to help change that. Laura Overdeck grew up with numbers. She always helped measure ingredients(食材)when her mother baked,and she learned about angles from her father. She went on to major in astrophysics(天体物理学)in college. Overdeck wanted her own children to be good at math,too.“And when our first child was about two,we just started giving her a math problem every night,”Overdeck said. The problem was usually a story,involving animals,cars or candies that let the kid count.“Our third child started,at age two,yelling that he wanted his own math problem because he saw his brother and sister doing it. And we thought,‘Wow,we have a household where math is the popular thing at bedtime,’”Overdeck said.

In February,Overdeck set up Bedtime Math,an Internet website where she posts daily puzzles for children. Overdeck is particularly keen to hook(吸引)children on numbers before they go to school. So why introduce little ones to math so early?

Sian Beilock,an expert on performance anxiety,says the more fun and familiar math is early on,the less likely children will feel nervous when they start to learn math in school.“My lab has shown recently that kids as early as first grade report feeling anxious about doing math,”Beilock said.

“You can hear totally educated adults say,‘You know I’m just not that good at math.’or‘I’m kind of afraid of math.’And that’s a totally acceptable thing for a well-educated person to say,but you never hear them say,‘Well,you know,I’m just not that good at reading.’,”Overdeck said. She wants children and their parents to become as fluent in numbers as they are in Harry Potter.

【小题1】Overdeck majored in astrophysics because she.
A.was really fond of mathematics
B.hoped to change math education in the US
C.had an interest in physics
D.would like her children to be good at math
【小题2】What can be inferred from Paragraph 2?
A.Stories can be used to encourage kids in solving math problems.
B.Math will become more popular in every household.
C.Math is enjoyable in Overdeck’s family.
D.The third child is cleverer than his brother and sister.
【小题3】Beilock’s attitude towards Overdeck’s idea is.
A.agreeableB.puzzled
C.anxiousD.critical
【小题4】The unfavorable situation of the US in math ability is shown by.
A.the popularity of Bedtime Math
B.children’s performance anxiety in school
C.people’s reaction to math
D.adults’ great fondness for Harry Potter

同类题2

   One of my earliest memories was watching my mom talk on our old phone. I was fascinated that she could talk to someone who wasn't actually in the room with her. 【小题1】 I was wondering how she managed to talk with someone she couldn't see.

That was a long time ago. Later, we had mobile phones that could be carried around the room. 【小题2】 These days I can send an e-mail around the world in a second. My daughter's smart phone has a hundred apps and a dozen social media accounts. She stores all of her information in a mysterious place known as“the cloud disk”, where she can take it out at any time. It seems that we are more connected in this world than ever before.

【小题3】 Few spend time talking face to face. Instead of looking into the eyes of our loved ones , we store their photos at our screens. It seems that the most connected generations are also the loneliest.

Don't let technology take our time and ruin our life. Make the time to communicate with each other. Take a walk on the beach with a friend. Have a long conversation with the phones off and the hearts on. 【小题4】

Remember that we are here to love each other,help each other and make this world a better place. 【小题5】 But when it can't, turn it off.

A.Connect offline as well as online.
B.Then came computers and smart phones.
C.Smart phones have both advantages and disadvantages.
D.We should communicate with each other with phones off.
E.When your communication equipment can help to do these things, then use it.
F.However, what bothers me is that we rarely associate with each other nowadays.
G.When she left the room, I slowly walked over to the phone and stared at it for a while.

同类题3

A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.
“It’s extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件),” said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. “The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own,” he said.
They engineered a series of systems to start and drive the robotic fly. “The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it’s connected to,” said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.
While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers’ fields or on the battlefield. “Basically it should be able to take off, land and fly around,” he said.
Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. “You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead,” he said. “So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis.”
【小题1】The difficulty the team of engineers met with while making the robotic fly was that __________.
A.they had no model in their mind
B.they did not have sufficient time
C.they had no ready-made components
D.they could not assemble the components
【小题2】It can be inferred from paragraphs 3 and 4 that the robotic fly __________.
A.consists of a flight device and a control system
B.can just fly in limited areas at the present time
C.can collect information from many sources
D.has been put into wide application
【小题3】Which of the following can be learned from the passage?
A.The robotic flyer is designed to learn about insects.
B.Animals are not allowed in biological experiments.
C.There used to be few ways to study how insects fly.
D.Wood’s design can replace animals in some experiments.
【小题4】Which of the following might be the best title of the passage?
A.Father of Robotic Fly
B.Inspiration from Engineering Science
C.Robotic Fly Imitates Real Life Insect
D.Harvard Breaks Through in Insect Study

同类题4

   The future is time that is to come. The future is not the present or the past. It is later. We have seen many possible futures in science fiction. They range from the world’s polar ice caps melting to nuclear winters. But not all futures are morbid. We have seen the human race spread all over our universe, humans and aliens living in harmony together all over the universe.

It is very likely that we will make some kind of breakthrough in our ability to travel through space sometime in the next 150 years. This would give us the ability to rule other planets.

Finally, the Earth will die whether it be in 1,000 years or 100,000 years. We will be forced to move to another planet then. It’s really just a matter of time. When we do so, what will we discover?

Personally, I think everyone will be speaking the same language in 200 years. A world government definitely seems to be in our future. It is stable and has few wars. Indeed, the only type of wars that can happen is the civil war.

And what if we face aliens? If they are friendly, we would probably benefit a lot from putting our knowledge together. They must have advanced technology to travel for great distances. We could benefit from their technology. But if they aren’t friendly, then we will be in trouble. Hope that we will have become advanced enough, smart enough, and generally a better race by the time we meet thein. But this is all probably being discussed for nothing, because any race out there among the stars is probably as curious as we are about other creatures.

【小题1】The underlined word “morbid” in Paragraph 1 can be replaced by __________ .
A.unpleasantB.exciting
C.probableD.serious
【小题2】What will humans do if the Earth dies?
A.Humans will have to face death.B.Humans will travel and live in space.
C.Humans will move to another planet.D.Humans will go back to the past time.
【小题3】After reading the passage, we can know that the passage is based on __________ .
A.scientific factsB.time and space
C.science fictionD.the author’s imagination