A black hole is a place in outer space with v...

A black hole is a place in outer space with very strong gravity. Gravity is a great force(力量) that shapes the universe. On Earth, gravity makes apples fall from trees. It keeps your feet planted on the ground. The gravity in a black hole is much stronger. It is so strong that nothing around it can get away from it, not even light.

Black holes are invisible. We can't actually see them because they don’t throw back light. But scientists can find them with space telescopes (望远镜)and special tools. The strong gravity makes nearby stars move in a certain way. By studying how the stars move, scientists can find out if they are flying around a black hole. Strange things happen around black holes. This makes black holes a popular subject of science fiction(科幻) stories, although they are very unreal.

A black hole forms when a star dies. The star falls in on itself and turns into a very small point. Because of its small size and huge mass(质量), the gravity will be so strong that it will pull light in and become a black hole. Black holes can grow huge as they continue to pull other things in and “eat” them. Many scientists believe that there are super-massive black holes at the center of galaxies, including the Milky Way.

The idea of the black hole was first suggested by two different scientists in the 18th century: John Michelle and Pierre-Simon Laplace. In 1967, a physicist named John Archibald Wheeler came up with the name “black hole”. Studying black holes can tell us many things about our galaxy and help scientists answer questions about the universe.

1.The word “invisible” in Paragraph 2 probably means “_________”.

A.far to go B.easy to find C.difficult to catch D.impossible to see

2.The third paragraph is mainly about_________.

A.how big black holes are B.how heavy black holes are

C.how black holes are formed D.how black holes “eat” stars

3.From the passage we learn_________.

A.a star's moving path can help scientists find a black hole

B.writers love writing about black holes because they are real

C.there aren't any black holes at the center of the Milky Way

D.John Archibald Wheeler found the first black hole in space

八年级英语阅读单选困难题查看答案及解析

Bears are found in Asia, Africa and America. They are very strong, with short tails and thick legs. Bears eat almost everything. They seem to enjoy meat, vegetables, fruit, milk and rice.

Bears are not quite dangerous as people imagine them to be. Like most animals, they will try to stay away from human beings. However, bears are not weak animals. Sometimes they kill hunters, for they can be very dangerous.

Bears have a good sense of smell but they have poor eyesight. They are also hard of hearing but they are very clever. They feed mainly on roots, frogs, fish and also small insects. They will sometimes kill deer and other large animals, but they seem to like small animals better.

In the cold area, bears hibernate, or go to sleep from October to April. Before they start to hibernate, they eat a lot and store fat. The mother bear has its babies, usually two, towards the end of hibernation. A large bear is much cleverer than a cat and most other animals. You may notice at the zoo how cleverly they ask for food. They sit up and hold out their paws. You would have to teach a dog such a trick but the bears learn this by themselves.

1. Like most animals, bears try to_______.

A. kill hunters

B. store fat after hibernation

C. stay away from people

D. be friendly with people

2.People imagine bears to be_______.

A. quite harmless　 B. very dangerous

C. very safe　　 　　 D. very clever

3.A mother bear usually gives birth to_______.

A. many babies　　 　 B. only one

C. some of babies　　 D. two babies

4.Which of the following not true?

A. Bears never kill large animals.

B. Bears are found in many places.

C. Bears have to hibernate in the winter.

D. Bears didn't need to be taught to ask for food

5."They are also hard of hearing." means they__________.

A. have big ears　　　　　 B. cannot see

C. cannot hear well　　　 D. can hear even weak noise

八年级英语阅读理解中等难度题查看答案及解析

Bears are found in Asia, Africa and America. They are very strong, with short tails and thick legs. Bears eat almost everything. They seem to enjoy meat, vegetables, fruit, milk and rice.

Bears are not quite dangerous as people imagine them to be. Like most animals, they will try to stay away from human beings. However, bears are not weak animals. Sometimes they kill hunters, for they can be very dangerous.

Bears have a good sense of smell but they have poor eyesight. They are also hard of hearing but they are very clever. They feed mainly on roots, frogs, fish and also small insects. They will sometimes kill deer and other large animals, but they seem to like small animals better.

In the cold area, bears hibernate, or go to sleep from October to April. Before they start to hibernate, they eat a lot and store fat. The mother bear has its babies, usually two, towards the end of hibernation. A large bear is much cleverer than a cat and most other animals. You may notice at the zoo how cleverly they ask for food. They sit up and hold out their paws. You would have to teach a dog such a trick but the bears learn this by themselves.

1. Like most animals, bears try to_______.

A. kill hunters

B. store fat after hibernation

C. stay away from people

D. be friendly with people

2. People imagine bears to be_______.

A. quite harmless　 B. very dangerous

C. very safe　　 　　 D. very clever

3. A mother bear usually gives birth to_______.

A. many babies　　 　 B. only one

C. some of babies　　 D. two babies

4. Which of the following not true?

A. Bears never kill large animals.

B. Bears are found in many places.

C. Bears have to hibernate in the winter.

D. Bears didn't need to be taught to ask for food

5. "They are also hard of hearing." means they__________.

A. have big ears　　　　 B. cannot see

C. cannot hear well　　　 D. can hear even weak noise

八年级英语阅读理解中等难度题查看答案及解析

Space travel is nothing new.The first spaceship with a human was sent up _____ space in 1961.Since then,people have not only travelled to space,_____ many of them have also lived there in space stations for some time.

The Soviet Union(苏联)sent the _____ space station into space in 1971.This space station was called Salyut Ⅰ.It _____ as a place where people could live while they observed space and did experiments.The first group of astronauts lived there for 23 days.The Soviet Union went on to make seven more Salyut space stations.At about the same time,the United States had _____ own space station,called Skylab.

Astronauts _____ in these space stations for a short time.However,it wasn't until the late 1980s when the Soviet Union sent the Mir space station that people began to live in space for a _____ time.

Living in space stations seems to be fun,but astronauts face many problems.One of them _____ food.All the _____ on space stations are put together on Earth and sent there by spaceship.Because the food has to last a long time,a lot of it has to be stored in cans.The space station does not have a fridge,but it has a cool room to keep fruit and vegetables fresh.Astronauts also eat many other foods ______ dried meat that do not need special care.

1.A.into B.with C.of

2.A.for B.but C.unless

3.A.ones B.one C.first

4.A.was found B.was built C.was bought

5.A.them B.they C.its

6.A.lived B.played C.took

7.A.more B.shorter C.longer

8.A.am B.is C.are

9.A.apple B.vegetable C.meals

10.A.such as B.at last C.next to

八年级英语完型填空困难题查看答案及解析

Star scientists have taken the first ever picture of a black hole, which is from a far away galaxy (银河系). It is 40 billion km across-three million times the size of the Earth-and has been described by scientists as "a monster".

The black hole is 500 million trillion km away and was photographed by a network of eight telescopes (望远镜) across the world.

Details have come out today in Astrophysical Journal Letters. Prof Heino Falcke, says "It is one of the heaviest black holes that we think there is. It is a real monster."

The picture shows a quite bright "ring of fire", as Prof Falcke describes it. The bright halo is caused by superheated gas fling into the hole. The light is brighter than all the billions of other stars in the galaxy-which is why it can be seen so far away from Earth.

The dark circle at the centre is the point at which the gas enters the black holes, which is an object that has such a large gravitational (万有引力的) pull, not even light can escape.

1.The black hole is ________ times the size of the Earth.

A.two million B.three million C.six million

2.In which part of the newspaper can we read this passage?

A.Sports B.Lifestyle C.Science

3.The underlined word in paragraph four means ________.

A.光圈 B.球体 C.火团

4.Which of the following is TURE?

A.The black hole is 500 million km away.

B.This black hole is the heaviest so far.

C.The light from the black hole is the brightest of all the stars.

5.From the passage, we can infer that ________.

A.Scientists are all unsatisfied with the result.

B.The black hole is dark.

C.It takes a lot of telescopes to work together to get a picture of the black hole.

八年级英语阅读单选简单题查看答案及解析

There are many kinds of ants in America. One kind is very strong. People are afraid of it, and animals are afraid of it, too.

These ants move in large groups.　 They eat all the animals, and they can eat wood houses.　 Sometimes even people are killed by them. When the ants come near, people leave their homes. But people are sometimes glad after the ants pass through, because they can see no insects ( 昆虫 ) or snakes .

1.Some ants in America can be very 　　　　 .

A. heavy　　 B. strong　　 C. light　　 D. thin

2.People and animals are afraid of 　　　　 .

A. one kind of ants　　 B. all kinds of ants　　 C. small ants　　 D. big ants

3.People get away from the ants because 　　　　 .

A. they can eat and kill elephants　　 B. they can also eat wood houses

C. they travel in large groups　　 D. they can even kill people

4.Where are the insects or the snakes after the ants pass through?

A. They hide themselves under the ground.

B. They have moved to other places before the ants come.

C. They have been killed and eaten up by the ants.

D. They have been killed by people.

5.Which is the best title (题目) for the story

A. Ants　　 B. American Ants　　 C. A Big Ant　　 D. A Strong Ant

八年级英语阅读单选困难题查看答案及解析

Eating in space is different from eating on the earth. The food that astronauts carry with them does not look like the food you eat. Some food is carried in closed bags. It is cooked and frozen before the astronauts get it. All the water is removed（分离开）from the food. In the spaceship，the astronaut puts the water back. He “ shoots ” hot or cold water into the food bag with a special gun. He eats the food that come in bite sizes. The astronauts puts a whole piece in his mouth at once. There can be no crumbs（碎屑）. Crumbs would float around the spaceship and get in the way. Meat and cake often come in bite sized pieces.

Astronauts cannot drink water from open cups. The water would float in drops in the air. The water is put in the special gun. The astronaut shoots the water into his mouth.

1.Astronauts put________ that they carry with them in close bag.

A.the clothes B.some flowers C.the food D.some stones

2.The passage doesn't say this, but from what we have read, we can tell that_______.

A.astronauts cannot eat anything in spaceship

B.astronauts cannot drink water in spaceship

C.astronauts cannot drink water in the usual way in a spaceship

D.astronauts must learn many new and different things

3.In the spaceship，astronauts put the water ______.

A.in a bottle B.in some bags C.back D.front

4.—How do the astronauts drink the water? — ________.

A.They shoot the water into their mouth with a special gun

B.They drink the water with a usual cup

C.They drink the water from an open cup

D.They often drink the water with their hands

5.The main idea of the passage is that _________.

A.astronauts eat less food in space than on the earth

B.astronauts get hungrier and thirstier in space than on the earth

C.eating and drinking in space is different from that on the earth

D.there is no enough food and water for astronauts

八年级英语阅读单选中等难度题查看答案及解析

Uncle Ted was very rich. But now he has no place to　　　　 .

A. live　　 B. live on　　 C. live in　　 D. live with

八年级英语单项填空极难题查看答案及解析

Mr. Black is American, but he is in Canada now. He is a tall man with funny glasses. He works in a big city but lives in a town far away. He lives on the twentieth floor of a building. Every morning he gets up early. Then he gets into the lift and it takes him down to the first floor. He runs to the bus stop and catches the early bus. It usually takes him about two hours to get to the factory by bus. Then he gets off the bus and walks into the workshop(车间) quickly. He starts his work at eight in the morning.

1.Mr. Black is from ________.

A. England　　　　　　　　 B. Canada　　　　　　　 C. America

2.The city is NOT _______ to the town.

A. far　　　　　　　　　　 B. near　　　　　　　　 C. from

3.Mr. Black lives on the ________ floor of the building.

A. twenty　　　　　　　　 B. twelfth　　　　　　 C. twentieth

4.How long does it take him to get to the factory from his home?

A. One hour

B. One and a half hours

C. About 120 minutes

5.When does he start his work in the morning?

A. At nine

B. At eight

C. At eight to eight

八年级英语阅读理解中等难度题查看答案及解析

听一篇短文，回答以下题。请根据短文内容，选择正确答案，完成信息记录表。

1.A. big B. small C. bright

2.A. honest B. kind C. helpful

3.A. sharing things B. reading books C. playing football

八年级英语听短文回答问题困难题查看答案及解析