A black hole is a place in space where gravity pulls so much that even light cannot get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.
Because no light can get out, people can’t see black holes. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently from other ones.
Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or “staff”, in an object.
Another kind of black hole is called “stellar”(星球黑洞). Its mass can be up to 20 times more than the mass of the sun. There may be many stellar mass black holes in Earth’s galaxy. Earth’s galaxy is called the Milky Way.
The largest black holes are called “supermassive”(超大质量黑洞). These black holes have masses that are more than one million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The supermassive black hole at the center of the Milky Way galaxy has a mass equal to about four million suns and would fit inside a very large ball that could hold a few million Earths.
Scientists think the smallest black holes formed when the universe began. Stellar black holes are made when the center of a very big star falls in upon itself, or falls apart. When this happens, it exploded part of the star into space. Scientists think supermassive black holes were made at the same time as the galaxy they are in.
A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole. Scientists can study stars to find out if they are flying around, or orbiting a black hole.
When a black hole and a star are close together, high-energy light is made. This kind of light cannot be seen with human eyes. Scientists use satellites and telescopes in space to see the high-energy light. The gravity of a black hole may become so strong that light cannot get out when ____________.
| A．the star is going to die |
| B．special tools are used on it |
| C．other stars come close to it |
| D．it is seen from the space telescopes |
According to the passage, which of the following is NOT true?
| A．A black hole can be very tiny but extremely heavy. |
| B．The gravity of a black hole holds all light in its center. |
| C．Scientists observe high-energy light through their own eyes. |
| D．Some small black holes came into being as early as the universe. |
Which can be inferred from the passage?
| A．Every galaxy must have a black hole. |
| B．A galaxy is the center of the universe. |
| C．A galaxy consists of a large group of stars and planets. |
| D．Earth’s galaxy is called the Milky Way. |
What does the last sentence in Paragraph 5 suggest?
| A．Neither the sun nor the earth is as heavy as a black hole. |
| B．There is only one supermassive black hole at the center of the Milky Way. |
| C．The supermassive black hole had existed before the Milky Way was formed. |
| D．There is a reason why the large black holes are called “supermassive”. |
The last two paragraph mainly focus on the question of _________.
| A．what a black hole is |
| B．how black holes form |
| C．how big black holes are |
| D．how scientists know about black holes |
Email has brought the art of letter writing back to life, but some experts think the resulting spread of bad English does more harm than good.
Email is a form of communication that is changing, for the worse, the way we write and use language, say some communication researchers. It is also changing the way we interact(交流) and build relationship. These are a few of the recently recognized features of email, say experts, which should cause individuals and organizations to rethink the way they use email.
“Email has increased the spread of careless writing habits,” says Naomi Baron, a professor of linguistics(语言学) at an American university. She says the poor spelling, grammar, punctuation and sentence structure of emails reflect(反映) a growing unconcern about the way we write.
Baron argues that we shouldn’t forgive and forget the poor writing often shown in email. “The more we use email and its tasteless writing, the more it becomes the normal way of writing,” the professor says.
Others say that despite its poor writing, email has finished what several generations of English teachers couldn’t: it has made writing fashionable again.
“Email is a critical new communication technology.” says Ian Lancashire, a professor of English at Toronto University. “It fills the gap between spoken language and the formal methods of writing that existed before email. It is the purest form of written speech.”
Lancashire says email has the mysterious ability to get people who are usually scared by writing to get their thoughts flowing easily onto a blank screen. He says this is because of email’s close similarity to speech. “It’s like a circle of four or five people around a campfire,” he says.
Still, he accepts that this new-found freedom to express themselves often gets people into trouble. Emails sent in a day almost exceed(超过) the number of letters mailed in a year. But more people are recognizing the content of a typical email message is not often exact.From what Baron says in the third paragraph we can see that ________.
| A．careless people use email more than careful people |
| B．email requires people to change their native language |
| C．professors in universities don’t need to use email |
| D．people communicate by email full of mistakes |
What does the underlined word “it”(in Paragraph 4) refer to?
| A．The poor writing. | B．Email. |
| C．The good writing. | D．A new communication technology. |
In Lancashire’s opinion, email is a wonderful technology because _______.
| A．it can be useful all over the world |
| B．it is the fastest way to communicate |
| C．we can express ourselves in a free way |
| D．we can save a lot of paper |
This passage mainly shows us that ______.
| A．people should stop using email to communicate |
| B．experts hold different opinions about email writing |
| C．Americans only use email to communicate |
| D．email makes people lose interest in English |
A great-grandfather has put up his Christmas tree for the 85th time after his father first bought it from a toy shop.
Douglas Hewitt, 85, has celebrated every Christmas with the artificial tree since he was born. His father bought the tree from a toy shop in Sheffield just months after Douglas was born. The four-foot tree remains the centre point of the Hewitt family household during every festive season.
Mr. Hewitt, of South Anston, South Yorkshire, said, “It reminds us of my childhood, our children’s childhood and our grandchildren and great-grandchildren’s after that. They all come and look at it and smile; it’s become part of the furniture. If we didn’t put that Christmas tree up, it wouldn’t feel like Christmas.”
The tree was passed down to Mr. Hewitt when he married Mavis. Mrs. Hewitt said, “Year after year we have just carried on using that one. You have to be a bit more careful with it now, as it’s fragile.”
Their daughter, June Murphy, also has fond memories of the Christmas tree. She said, “It was in my grandparents’ home and then it was given to us. It looks a little thin now, as each time you get it out something else falls off. It’s become a bit of a family joke. Each year someone has to comment ‘not again!’ But it’s a Christmas tradition of getting the tree out that we all love. We’d all be sad to see it go, as I think it would be hard to find such a loved replacement.”
Mr. Hewitt said, “There were a lot more branches on it, and it’s lost its feathers that were all along the edge. There were little candle holders（蜡烛架）on the ends and little legs on it, but unfortunately they’ve been lost over the years.”Where did Douglas Hewitt get the Christmas tree?
| A．He got it from his father. |
| B．He bought it from a toy shop. |
| C．He made it by himself. |
| D．He cut it down in a forest. |
What does Mr. Hewitt want to tell readers in the third paragraph?
| A．It may be the last year that the tree appears in this house. |
| B．His family decorate their house with this Christmas tree. |
| C．This Christmas tree reminds him that Christmas is on the way. |
| D．His family has a special feeling towards this Christmas tree. |
The underlined word “fragile” in the fourth paragraph probably means_______.
| A．a little strange | B．easily broken |
| C．quite small | D．not beautiful |
Why does her family put up the Christmas tree every year according to June Murphy?
| A．To honor her grandparents. |
| B．To save the family money. |
| C．To keep up the family tradition. |
| D．To create a friendly atmosphere. |
Babies who watch TV are more likely to show late learning development and language at 14 months, especially if they are watching programs aimed at adults and older children, according to a new study, which would probably surprise those parents who leave their babies in front of a TV set.
Babies who watched 60 minutes of TV daily had developmental scores a third lower at 14 months than babies who were watching less TV. Although their developmental scores were still in the normal range, the difference may have been due to the fact that when children and parents are watching TV, they are missing the talking, playing and other communications that are important to learning and development.
This new study, which appeared in the Aechives of Pediatric and Adolescent Medicine, followed 259 lower-income families in New York, most of whom spoke Spanish as their primary language at home. Other studies of higher-income families have also come to the same conclusion: TV watching is not only non-educational, but it seems to slow down babies’ development.
But what about “good” TV, like Sesame Street? The researchers didn’t find any difference when compared to non-educational programs designed for small children, like Spongebob SquarePants. Earlier research by some of the same scientists, most of whom are at New York University School of Medicine’s Bellevue Hospital Centre, has found that parents whose children watch non-educational TV programs like Spongebob SquarePants spend less time reading to their children or teaching them.
At this point, parents reading this will probably be astonished. TV is so often a parent’s good friend, keeping children happily occupied（占时间）so that the adults can cook dinner, answer the phone, or take a shower. But, clearly, this electronic babysitter（保姆）is not an educational aid. It is best to make sure the babies are fast asleep if you have to watch TV.According to the first paragraph, 14-month-old babies who watch TV probably_______.
| A．learn things quickly |
| B．prefer programs for older children |
| C．surprise their parents with their development |
| D．speak later than babies who don’t |
Babies who watched 60 minutes of TV daily had lower developmental scores perhaps because _______.
| A．they watch non-educational programs |
| B．they have little communication with their parents |
| C．they lost interest in real things |
| D．their parents don’t speak English at home |
We can infer from the passage that______.
| A．Educational and non-educational TV have different effects on babies |
| B．Many parents leave babies to the TV to do their own things |
| C．Educational TV is very popular among higher-income families |
| D．Lower-income families tend to teach their babies at home |
Which would be the best title for the passage?
| A．Developing Better Learning Ability |
| B．A New Study on Babies’ Bad Habits |
| C．TV Watching Is Bad for Babies’ Brains |
| D．Make Sure Your Babies Watch “Good” TV Programs |
Who doesn’t have a clingy friend? You know, that person who often calls, texts, and e-mails. He often needs your attention, your feedback, or your help. Worse yet, he often gets antsy when you don’t reply immediately.
Is there ever a moment when you just want to turn off your phone and be alone? But you won’t do that to a friend. Actually there are better ways to deal with a clingy friend.
Give Yourself Some Time
If you really need some time for yourself, or you’re just tired of being the listener, just explain to your friend honestly that you want or need some time of your own. Even the most determined friends will understand and give you some space. Of course, those extremely clingy friends will still call, text, and e-mail. If that happens, just reply gently that you need some time for yourself.
Suggest an Activity for Your Friend
If you are tired of different get-togethers and outings, then you should advise your friend to do something alone. If you both like sports, you could tell your friend to have a try at the new gym. If your friend likes your suggestion, but insists that you go along, just explain that you’ve already visited the gym. Mention that you enjoy the gym. If you’re lucky , he’ll try it, and like it.
Introduce Your Clingy Friend to Others.
Your clingy friend may just be lonely or have trouble meeting new people. If that’s the case , introduce him to others with similar interests. He may just make some new friends.
_________________________________________
There’s no reason for you to rudely tell your clingy friend that he’s a pain in the neck. Just follow the above advice to take your time back. After a while, your clingy friend should learn to value your time and your friendship.What does the underlined word “antsy” in Paragraph 1 probably mean?
| A．busy | B．silent | C．nervous | D．bored |
What does the author suggest you do in the first advice?
| A．Understand your friends. |
| B．Be honest with your friends. |
| C．Spend more time with your friends. |
| D．Keep your distance from your friends. |
Which of the following can best fill in the blank of the last paragraph?
| A．Give Your Friend Some Time | B．Take Your Time Back |
| C．Don’t Be Rude | D．Value Your Friendship |
We can learn from the passage that clingy people __________.
| A．are very confident | B．have little free time |
| C．don’t respect others | D．don’t want to be alone |
Two traveling angels(天使) stopped to spend the night in the home of a wealthy family. The family was rude and refused to let the angels stay in the guest room. Instead the angels were given a space in the cold basement. As they made their bed on the hard floor, the older angel saw a hole in the wall and repaired it. When the younger angel asked why, the older angel replied: “Things aren’t always what they seem.”
The next night the pair came to rest at the house of a very poor but very hospitable(好客的)farmer and his wife. After sharing what little food they had, the couple let the angels sleep in their bed where they could have a good night’s rest. When the sun came up the next morning, the angels found the farmer and his wife in tears. Their only cow, whose milk had been their only income, lay dead in the field.
The younger angel was very angry and asked the older angel, “How could this happen? Why didn’t you watch out for the cow? The first man had everything, yet you watched over his house,” she accused. “The second family had little but was willing to share everything, and you did not help.”
“Things aren’t always what they seem,” the older angel replied. “When we stayed in the basement, I noticed there was gold stored in that hole in the wall. Since the owner was so greedy and unwilling to share his good fortune, I asked God if I could seal(封口)the wall so he couldn’t find it. Then last night as we slept in the farmer’s bed, the angel of death came for his wife. I asked God if the angel could take the cow instead. Things aren’t always what they seem.”Why did the older angel repair the hole for the rich family?
| A．Because the basement was too cold to stay in. |
| B．Because she wanted to save the gold for the poor. |
| C．Because she wanted to punish the greedy owner. |
| D．Because she believed that one should always be ready to offer help. |
In paragraph two, the pair refers to __________.
| A．the poor couple | B．the rich couple |
| C．the guests | D．the angels |
The younger angel was very angry because __________.
| A．the older angel killed the farmer’s cow |
| B．the older angel treated the two families unfairly |
| C．the wealthy man gave them a bad place to live |
| D．the angel of death took the cow away |
The story tries to tell the reader that ___________.
| A．sometimes things are not what they seem |
| B．angels are always ready to help the poor |
| C．angels are always ready to help the rich |
| D．the young should always learn from the old. |
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