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

“I am going to the store, Uncle Moti, "Mina said. "Do you want to come along? You have not seen much of the neighborhood yet. ”

Uncle shook his head. "No, thank you, "he said. “It is just too loud and crowded for me. Everyone is always on the go, while I am used to the peace and quiet of our village. I feel afraid out there, like a frightened(害怕的)child. ”Mina sat on the sofa next to her uncle. "Tell me about the village, Uncle Moti, "she said. “Would I like it there? ”

Uncle laughed. "Without a doubt, you would find it dull at first-the loudest sound is usually birdsong. The people I meet on the street are all people I know, and we stop and talk or go to the tea shop and have tea. There are not many shops, but the shopkeepers know all their customers. Everyone is friendly and has a smile for everyone else. ”

“Sounds really nice, ”Mina said. “But I think maybe it is not different in every way. I really wish you would come with me, and I could show you why I say that. ”Uncle sighed and got up, saying, “All right, Mina, I will go. ”

Out on the street, cars zoomed by, some of them honking. Uncle looked very nervous at all the noise and activities, and Mina took his hand.

"Look, "she said, "there is my friend Nate, and coming down the street is my teacher, Ms. Sanchez. "Mina waved to Nate, who waved back, and called hello to her teacher. Then she led her uncle down the street to the store, where she greeted the shopkeeper. "Hi, Ms. Franklin, this is my uncle Moti, who has come here to live. "

"Over here, "Mina took her uncle’s arm and led him across the street. A sign over a door read "Navid’s Tea Shop. "Uncle smiled. They went in and sat at a table. They ordered tea, and Uncle sighed happily.

"Well, I see what you were trying to show me, "he said. "This neighborhood is your village. Now it will be mine to. It has friends, kind shopkeepers, birds, and even a tea shop. . . "

1.At first, Uncle Moti didn’t want to go out with Mina because .

A. he missed his family in the village

B. he felt very tired after a long journey

C. he didn’t get used to the life in Mina’s neighborhood

D. people in Mina’s neighborhood were unfriendly to him

2.From the underlined sentences in the passage, we can infer(推断)that Mina is a girl.

A. brave B. caring C. creative D. humorous

3.The sentence" "in the passage shows that Mina’s neighborhood and Uncle’s village are similar.

A. I feel afraid out there, like a frightened child.

B. You would find it dull at first-the loudest sound is usually birdsong.

C. Out on the street, cars zoomed by, some of them honking.

D. It has friends, kind shopkeepers, birds, and even a tea shop.

4.The story suggests that Uncle Moti will probably later on.

A. still feel frightened as before

B. start to look for a job in a tea shop

C. be willing to go out in Mina’s neighborhood

D. tell people why he came to Mina’s neighborhood

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