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 |
Are you a volcano lover? Here is a list of some of the world’s most beautiful volcanoes that our travel agency can offer you to visit. Don’t miss them!
Mount Mayon, the Philippines
Located about 450 km southeast of Manila on the island of Luzon, Mount Mayon is the most active volcano in the Philippines; a September 2014 eruption forced thousands to flee the area. Those who hike the volcano are rewarded with views of the towns on the Albay province and the Pacific Ocean. But even those who prefer the view from a distance have historical good point at the Cagsawa Ruins, once an 18th Century Franciscan church that was destroyed by an 1814 eruption.
Kilauea and Mauna Kea, Hawall
Hawaii’s volcanoes are known for their active eruptions and extraordinary scenes. Mauna Kea is around one million years old, while Kilauea is the youngest volcano in Hawaii and has been erupting continuously since 1983. The lava falls straight into the sea, creating fantastic forms of black rocks and smoke clouds.
Mount Kelimutu, Indonesia
Kelimutu’s three mysterious crater lakes attract both scientists and tourists to the island of Flores in Indonesia’s East Nusa Tenggara province. One is emerald green（翡翠绿），another dark red, and the third pitch black. Scientists say the lakes take on such colors because the volcanic gases met the lakes’ minerals centuries ago.People who hike Mount Mayon can enjoy the following EXCEPT .
| A．views of the towns in the Albay province |
| B．views of the Pacific Ocean |
| C．views of the Cagsawa Ruins |
| D．views of Indonesia’s East Nusa Tenggara province |
According to the text, Kilauea .
| A．is an active volcano |
| B．stopped erupting in 1983 |
| C．is the youngest volcano in the world |
| D．forces thousands to flee in 2014. |
The colors of Kelimutu’s three mysterious crater lakes are due to .
| A．water pollution | B．different environment |
| C．chemical reaction | D．different temperatures |
Like human beings, dogs may catch cold because of cold weather, wet conditions or can also get it from other sick dogs. If a dog has a running nose and watery eyes, coughs or sneezes(打喷嚏）, then it is quite probable that the dog has caught cold.
A dog's cold can get over after a few days without treatment but it totally depends upon the owner to treat it with medications or improve its immune power（免疫力）to get rid of the cold naturally. Following are some of the things you can do if your dog gets a cold.
You can improve its immune power by giving it proper nutrient diet. Healthy food can really do wonders. Try to give it food which is either suggested by the vet（兽医）or is healthy for your pet. Increase the intake of food which is rich in vitamins A, C and E.
Keep your dog warm. The best place for your dog in winter is inside your house. Do not keep your dog outside when it is cold and wet. At home you can also keep the dog warm with the help of carpets. This will make him comfortable and help him to recover fast.
Increase the fluid（流质）intake as it helps a lot. Water can be the best choice but you can also add broth（肉汤）in water which will give your dog strength. Warm water will make your dog more comfortable and will also keep the dog away from the respiratory infections（呼吸道感染）.
Steam treatment is considered to be effective in getting rid of cold. It makes the nasal（鼻的）passage wet, which helps proper breathing. Just fill your bathroom with steam and leave your dog inside the bathroom for 15 minutes. Do it nearly 2 to 3 times a day and you will see your dog recovering.
These are some of the things you can do to help your dog recover from cold. However, if you are not able to find any improvement in its health, then turn to the vet for help immediately. Take your dog for regular checkups so as to avoid complications（并发症）.From the first paragraph we know about __________.
| A．the difficulty in keeping a dog as a pet |
| B．characteristics(特征) of sick dogs |
| C．the similarities between dogs and human beings |
| D．causes and symptoms（症状）of cold in dogs |
When your dog catches cold, you should feed it on _______.
| A．its favorite food | B．the suggested food by the vet |
| C．some meat and water | D．food rich in vitamin B |
When a dog catches cold, it is wrong to ________.
| A．keep it inside during cold and wet weather |
| B．leave it inside the bathroom full of steam |
| C．let it eat too much solid（固体）food |
| D．keep it sleeping on carpets at home |
It can be learnt from the text that _________.
| A．a dog’s cold can always disappear naturally |
| B．it’s quite easy to make a sick dog recover from cold |
| C．treating a dog’s cold sometimes needs a vet’s help |
| D．cold in dogs won’t spread between each other. |
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
My husband, my four-month-old daughter and I set out on a five-day driving journey from California to Washington. We had to stop frequently because our little child needed to stretch from the car seat.
One of our stops, once we crossed the Oregon border, was at a Black Bear Diner. Walking towards the front door we noticed a gentleman standing at one side. He was clearly untidy, without shoes and wearing worn clothing. We passed right by him and opened the restaurant door. Then something told me to go back.
Holding my daughter, I turned around and said to the gentleman, “Sir. Are you hungry?” He said, “Yes.” I then asked, “May we buy you something to eat?” He responded with, “Sure, I can order something myself.”
My husband opened the door and the gentleman went straight to the counter. I told him to order whatever he wanted. The manager of the restaurant came over quite quickly and looked frightened. I spoke before he had an opportunity to. “This gentleman will have lunch with us today,” I said. “Please add his order to our bill.” The manager said with a frown(皱眉), “Okay.” We turned to our table and the gentleman said, loudly and quickly, “Thank You!” We were seated and upon completing our meal we were handed our bill. I asked my husband what the gentleman had ordered. One fresh orange juice, one coffee, one breakfast combination with a side of hash browns.
When we left the restaurant I looked for the gentleman but didn’t see him, but that very small act just made my day. I hope in some small way we were able to add some joy to his life, even if only for a few minutes. From the appearance of the gentleman, we can guess he was probably a(n) _____.
| A．waiter | B．actor | C．beggar | D．worker |
The manager of the restaurant looked frightened because _____.
| A．the man was not friendly |
| B．the man had stolen something from the restaurant |
| C．he had fired the man before |
| D．he was afraid the man wouldn’t afford to pay the food |
From the passage, we can infer the man _____.
| A．was thankful for their kind act |
| B．felt ashamed and went away |
| C．was hungry and ate a lot of food |
| D．was too proud to accept their offer |
The phrase “made my day” in the last paragraph probably means ______.
| A．wasted my money | B．made me very happy |
| C．made me feel sorry | D．moved me deeply |
The iPhone, the iPad: each of Apple’s products sounds cool and has become a fad(一时的风尚). Apple has cleverly taken advantage of the power of the letter “i” –-- and many other brands are following it. The BBC’s iPlayer --- which allows Web users to watch TV programs on the Internet ---used the title in 2008. A lovely bear --- popular in the US and UK --- that plays music and video is called “iTeddy”. A slimmed-down version(简装本) of London’s Independent newspaper was started last week under the name “i”.
In general, single-letter prefixes(前缀) have been popular since the 1990s, when terms such as e-mail and e-commerce(电子商务) first came into use.
Most “i” products are targeted at （针对）young people and considering the major readers of Independent’s “i”, it’s no surprise that they’ve selected this fashionable name.
But it’s hard to see what’s so special about the letter “i”. Why not use “a”, “b”, or “c” instead? According to Tony Thorne, head of the Language Center at King’s College, London, “i” works because its meaning has become ambiguous. When Apple uses “i”, no one knows whether it means Internet, information, individual or interactive, Thorne told BBC Magazines. “Even when Apple created the iPod, it seems it didn’t have one clear definition（定义）,” he says.
“However, thanks to Apple, the term is now connected with portability (轻便) .”adds Thorne.
Clearly the letter “i” also agrees with the idea that the Western World is centered on the individual. Each person believes they have their own needs, and we love personalized products for this reason.
Along with “Google” and “blog”, readers of BBC Magazines voted “i” as one of the top 20 words that have come to define the last decade(十年).
But as history shows, people grow tired of fads. From the 1900s to 1990s, products with “2000” in their names became fashionable as the year was connected with all things advanced and modern. However, as we entered the new century, the fashion disappeared. People use iPlayer to __________.
| A．listen to music | B．make a call |
| C．watch TV programs online | D．read newspapers |
The underlined word “ambiguous” means “__________”.
| A．popular | B．uncertain | C．clear | D．unique |
Nowadays, the “i” term often reminds people of the products which are __________.
| A．portable | B．environmentally friendly |
| C．advanced | D．recyclable |
The writer suggests that __________.
| A．“i” products are often of high quality |
| B．I Teddy is alive bear |
| C．the letter “b” replaces letter “i” to name the products |
| D．the popularity of “i” products may not last long |
Reading is very important to help you learn English. To learn as much as you can from reading, you need to read different kinds of English. This book provides not only different kinds of English but also a good way to check your reading ability.
There are four parts in the book:
Part 1 is Messages: In this part somebody wants to give information in writing to somebody else. There is a test on timetables and a test on text messages.
Part 2 is People: In this part all the tests are about people. For example, there is an informal letter between friends. There is formal ( 正式的) English in biography ( 传记). There is a job application as a model to help with your writing, as well as testing your reading.
Part 3 is Places: In this part, too many different kinds of English are shown, some informal and some formal. There is the informal English of a holiday postcard. There is also the formal English in a letter of complaint.
Part 4 is Things: You will find some descriptive writing in this part. There are descriptions of clothes and of a computer.
You can do these tests in any order you like, or you can do all the tests with a formal or informal text. I enjoyed writing this book and I hope you enjoy using it. We can find the introduction to a product in ______,
| A．Part 1 | B．Part 2 | C．Part 3 | D．Part 4 |
The passage is most probably written for _____.
| A．test designers | B．students |
| C．parents | D．teachers |
What is the best title of the book?
| A．Test Your Reading |
| B．Help with Your Writing |
| C．Learn Different Kinds of English |
| D．Practice English in Different Ways |