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”.
65. 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
My first full-time job after high school was selling vacation packages via the telephone for a well-known company. One day, I was put through to a man who sounded a bit out of breath. I started with my normal pitch (音高), expecting to hear the normal reply —"I don’t want any."Instead, he spoke in a faint, weak voice and told me how he wished to take a vacation I was offering, but he couldn’t because he was dying of illness. He explained how he was lacking in oxygen then, and it took almost all his energy to answer the call. He asked if I smoked, which I did, and begged me to stop. He told me smoking was what was killing him. He told me to spend every day with my loved ones, and tell them how much I love them. At this point, I couldn’t control myself. We ended the call, but I held on my phone to prevent another call coming in so I could collect myself.I wrote down his name and address, and sent him a card appreciating his advice and praying for him and his family. Shortly after, I received a letter from Frank, along with a picture of him and his wife. We continued to write back and forth over the next few months, and became very fond of each other. He was old enough to be my grandfather, and in many ways, I felt as if he was.About a year later I received a letter from his wife. When I started to read, tears came to my eyes. She told me how Frank’s battle with the disease had finally come to an end, and he passed away shortly before the Christmas. She wanted to thank me for the letters to Frank, and explained how Frank touched many lives over the years. At his funeral, to show just that, they read the 1st letter I had written to Frank to show how he affected a 19-year-old he’d never met.
The author was then probably working for ______.
| A．a travel agency | B．a cigarette company |
C．an e-shopping store | D．a vacation school |
The underlined part "collect myself" in the second paragraph probably means "_______".
| A．gather together | B．comfort myself |
C．relax myself | D．calm down |
What can we infer from the text?
| A．Frank was in hospital while answering the phone. |
B．Frank is actually the author’s grandfather. |
C．There was something wrong with Frank’s lung. |
D．The author asked Frank to travel and he took his advice. |
We can learn from the text that the author ________.
| A．took down Frank’s name and address to visit him in person |
B．was warmly welcomed by her customers when she called them |
C．didn’t stop smoking even though Frank asked him to |
D．kept in touch with Frank through letters until he died |
At Frank’s funeral the author’s 1st letter to Frank was read in order to ____.
| A．encourage people to fight against disease and live bravely |
B．indicate that Frank touched many people’s hearts |
C．show the good relationship between Frank and the author |
D．praise Frank and give thanks to the author |
When 18th-century scientists first came across Australia’s platypus(鸭嘴兽), they thought it was a trick. It is not surprising that the platypus made people confused. This funny-looking animal has feet and is a kind of warm-blooded mammal.
While other mammals usually keep their blood at around 37 degrees, the platypus has a lower body temperature of 32 degrees. As to its appearance, the platypus’mouth is not really like ducks’at all; its mouth actually looks a bit soft. The platypus closes its eyes when swimming. It uses its mouth to pick up outside information made by the creatures underwater.
Strangest of all, the platypus is a mammal that can lay eggs. And there is only one other kind of mammal that can lay eggs, the echidna (针鼹鼠) of Australia. Both the platy-pus and the echidna lay soft-shelled eggs, and both feed their young with their own milk that comes out of their skin. These animals also walk in a way that is similar to crocodiles(鳄鱼), with legs on the sides of their bodies rather than under them.
Though pretty, in a special way, the platypus is actually one of the few mammals that are poisonous. A male platypus has knife-like bones on its back legs which have enough poison to kill a dog.
The platypus has the honor of being one of the oldest mammals in the world. Until the early 20th century, it was hunted for its fur, but the situation has changed. Although the platypus is easily affected by pollution, it is not under any immediate threat. What can we learn about the platypus according to the text?
| A．It has a lower body temperature than other mammals. |
| B．It only closes its eyes when underwater. |
| C．It’s the only poisonous mammal in the world. |
| D．It feeds its young on wild animal meat. |
Which of the following is NOT used as a comparison with the platypus in the text?
| A．The crocodile. | B．The echidna. | C．The duck. | D．The dog. |
The following characteristics of the platypus have been described in the text EXCEPT ________.
| A．its natural enemy | B．its appearance |
| C．its walking pose | D．its daily diet |
We can infer from the last paragraph that the platypus _______.
| A．is hunted for its meat | B．is in danger of extinction |
| C．is endangered by air pollution | D．is well-protected now |
Which of the following would be the best title for this text?
| A．Platypus, a Trick? |
| B．Platypus, the Only Warm-Blooded Mammal |
| C．The Characteristics of Platypus |
| D．The Strange Mammal —Platypus。 |
It is really a happy thing to look back on the days I spent with Jennie. We met in night school. After Jennie and I had completed the required courses, we started teaching in the same school. For a time we were just casual friends, but one day, when I was telling Jennie about my problem son, we discovered we were kindred (同类的) spirits. "He’s a difficult little character," I explained. Jennie looked thoughtful. "Maybe you’re only seeing him with your eyes." She was silent for a moment and then added softly, "It is only with the heart that one sees rightly." I stared at her. "You’re quoting (引用) that! It’s from The Little Prince, Saint-Exupery’s book for children, one of my favorites. You know it, too?" Jennie nodded. "I love it. I’ve read it so often. I’ve practically memorized it."
Now, when I think of Jennie, I recall that book because Jennie —more than anyone I know —possessed the gift of seeing with the heart.
From that moment of a treasured book shared, our friendship grew steadily. It wasn’t that I didn’t have an excellent relationship with my husband and son, but my mother had died shortly after my marriage, and I had neither sisters nor daughters. I realize, now, how I needed someone to share those little, seemingly unimportant things that add so much to life —things that must be shared to be fully appreciated.
And it was Jennie who helped me with my fourth-grade problem child. One day I was at my wit’s end. "What he needs is a good beating!" I exploded.
"He’s probably had plenty of those," Jennie said. "Maybe he just needs sincere praise for anything he does right, and a hug or two each day." I followed this suggestion, and eventually, because of Jennie, I discovered a lovable little boy.
Looking back, I have to admit that she taught me so much. The days I spent with her has become one of my happiest memories.What does the underlined part mean in the fourth paragraph?
| A．I was unsure of how to treat my son. |
| B．I decided to give up my job. |
| C．I faced financial difficulties. |
| D．I was very disappointed with myself. |
How did the author and Jennie’s friendship grow?
| A．They both were interested in children’s education. |
| B．They both liked a novel, The Little Prince. |
| C．They often chatted together about their families. |
| D．They both worked in the same school. |
We learn from the text that __________.
| A．the author has the gift of seeing with the heart |
| B．the author had no friends before meeting Jennie |
| C．the author had lost her mother before her marriage |
| D．the author seldom praised her son in the past |
How does the author feel about her family?
| A．No one listened to her seemingly unimportant things. |
| B．She didn’t get along well with her husband and son. |
| C．She once seldom spoke to her mother. |
| D．She felt quite lonely in her family. |
The text is mainly about _________.
| A．how to educate children properly |
| B．the fact that we should see nature differently |
| C．the influence of friendship in life |
| D．how friendship begins and develops |
Many people think a telephone is essential. But I think it is a pest and a time waster. Very often you find it impossible to escape from some idle or curious chatter-box, or from somebody who wants something for nothing. If you have a telephone in your own house, you will admit that it tends to ring when you are asleep, or in the middle of a meal or a conversation, or when you are just going out, or when you are taking your bath. Are you strong minded enough to ignore it, to say to yourself,“Ah, well, it will all be the same in a hundred years’ time” You are not. You think there may be some important news or messages for you. I can assure you that if a message is really important it will reach you sooner or later. Have you never rushed dripping from the bath, or chewing from the table, or dazed from the bed, only to be told that you are a wrong number?
But you will say, you need not have your name printed in the telephone directory, and you can have a telephone which is only usable for outgoing calls. Besides, you will say, isn’t it important to have a telephone in case of emergency—illness, an accident, or fire? Of course, you are right, but here in a thickly populated country like England one is seldom far from a telephone in case of dreadful necessity.
I think perhaps I had better try to justify myself by trying to prove that what I like is good. I admit that in different circumstances—if I were a tycoon(business VIP),for instance, or bed ridden I might find a telephone essential. But then if I were a taxi-driver I should find a car essential.
Let me put it another way: there are two things for which the English seem to show particular talent; one is mechanical invention, the other is literature. My own business happens to be with the use of words but I see I must now stop using them. For I have just been handed a slip of paper to say that somebody is waiting to speak to me on the telephone. I think I had better answer it. After all, one never knows, it may be something important.The passage is mainly discussing _______.
| A．that we should be strong enough to ignore a phone call |
| B．that important message will reach you sooner or later |
| C．whether it’s necessary to answer all phone calls |
| D．whether it is necessary to have a telephone |
Judging from the passage, who is strong-minded enough to ignore a phone call?
| A．The author. | B．A tycoon. |
| C．A taxi-driver. | D．Hardly anyone. |
According to the passage, the author________.
| A．thinks the telephone should go out of our life |
| B．likes to be different from other people |
| C．thinks the telephone is annoying |
| D．speaks favourably of a telephone |
In the author’s opinion, which of the following is NOT true?
| A．Nearly everyone has been told a wrong number. |
| B．It’s necessary for everyone to have a telephone. |
| C．He himself can not decide whether to answer a call. |
| D．A telephone directory may bring in unexpected calls. |
Boiler rooms are often dirty and steamy, but this one is clean and cool. Fox Point is a very new47-unit living building in South Bronx, one of the city’s poorest areas. Two-thirds of the people living there are formerly (以前) homeless people, whose rent is paid by the government. The rest are low-income families. The boiler room has special equipment, which produces energy for electricity and heat. It reuses heat that would otherwise be lost to the air, reducing carbon emissions(碳排放)while also cutting costs.
Fox Point is operated by Palladian, a group that specializes in providing housing and services to needy, people. Palladian received support from Enterprise Community Partners (ECP), which helps build affordable housing by providing support to housing developers.
ECP has created national standards for healthy, environmentally (环境方面) clever and affordable homes which are called, the Green Communities Standards. These standards include water keeping, energy saving and the use of environmentally friendly building materials. Meeting the standards increases housing construction costs by 2%, which is rapidly paid back by lower running costs. Even the positioning of a window to get most daylight can help save energy.
Michael. Bloomberg, New York's mayor, plans to create 165,000 affordable housing units for500,000 New Yorkers. Almost 80% of New York City’s greenhouse-gas emissions come from buildings, and 40% of those are caused, by housing. So he recently announced that the city’s Department of Housing and Preservation and Development (DHPD) , whose duty is to develop and keep the city’s supply of affordable housing, will require all its new projects to follow ECP’s green standards.
Similar measures have been taken by other cities such as Cleveland and Denver, but New York’s DHPD is the largest city developer of affordable housing in the country. What is the purpose of describing the boiler room in the first paragraph?
| A．To explain the measures the city takes to care for poor people. |
| B．To suggest that affordable housing is possible in all areas. |
| C．To show how the environment-friendly building works. |
| D．To compare old and new boiler rooms. |
What is an advantage of the buildings meeting the Green Communities Standards?
| A．Lower running costs. |
| B．Costing less in construction. |
| C．Less air to be lost in hot days. |
| D．Better prices for homeless people. |
It can be learned from the text that,
| A．New York City is seriously polluted |
| B．people’s daily life causes many carbon emissions in New York City |
| C．a great number of people in New York City don't have houses to live in |
| D．some other cities have developed more affordable housing than New York City |
What is the main purpose of this text?
| A．To call on people to pay more attention to housing problems. |
| B．To prove that some standards are needed for affordable housing. |
| C．To ask society to help homeless people and low-income families. |
| D．To introduce healthy, environmentally clever-and affordable housing. |