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阅读理解
Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.
You can easily find out the pull of the earth. If you weigh (称体重) yourself, you will know how much gravity is pulling you.
Since there is gravity, water runs downhill. When you throw a ball into the air, it falls back down. Because of gravity you don't fall off the earth as it whirls (旋转) around.
Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. The spaceship will go so fast that it can escape (逃离)the earth's gravity and carry you into space.
(1) In this passage (文章), the word “gravity” means
[ ]
A. the pull of everything
B. the force (力) which attracts (吸引) the earth towards us
C. the force of attraction among things
D. the force which attracts things towards the center of the earth
(2) When you slip (滑倒)on something, you
[ ]
A. always fall down to the ground
B. sometimes fall down to the ground
C. go up into the air
D. often fall off the earth
(3) Gravity is so strong that ________
[ ]
A. it can't make you throw a ball into the air
B. it can keep everything on the earth
C. you can jump at least seven feet high
D. you can't go up into the air by spaceship
(4) Because of “gravity ”,________
[ ]
A. water flows (流) everywhere
B. we can go everywhere by ship
C. water flows downwards on the earth
D. water flows at the foot of hills
(5) We can get away from the earth by spaceship because
[ ]
A. the spaceship goes very fast
B. the earth has no gravity to the spaceship
C. the spaceship has a strange energy (能量)
D. the spaceship can go higher than any other thing on the earth
查看习题详情和答案>>If you go out sometimes at night, you'll see the moon high up in the sky. The moon is far away from the earth.
But it is our nearest neighbour in space. In 1969 two Americans visited it by spaceship. It was one of the most exciting moments of that year.
The sky looks black from the moon and you'll see the earth up in the sky. You will also see many, many stars.
You can't find any living things there. It's too hot in the day and too cold at night. And there's no air or water there. Nothing can live on it.
It is difficult for men to walk on the moon. Everything becomes much lighter. You can jump much higher on the moon than on the earth. If you throw a ball, it would fly very far. It's very interesting to walk on the moon!
(1) The story says you may ___________.
[ ]
|
A ．throw the moon |
B ．get to the earth |
|
C ．get to the moon |
D ．play balls on the earth |
(2) You'll see the earth _________ when you look up from the moon.
[ ]
|
A ．on the ground |
B ．in the sky |
|
C ．in the rain |
D ．in the snow |
(3) On the moon, a ball will ________ when you throw it.
[ ]
|
A ．go very far |
B ．not go very far |
|
C ．fly to the earth |
D ．look back |
(4) On the moon you can jump _________.
[ ]
|
A ．just a little |
B ．a metre high |
C ．to the earth |
D ．high |
(5) Does it rain on the moon?
[ ]
|
A ．Yes. |
B ．No |
|
C ．Only on the grass |
D ．Sometimes. |
jump any higher because the earth pulls you hard. The pull of the earth is called gravity.
You can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity
is pulling you.
Since there is gravity, water runs down hills. When you throw a ball into the air, it falls back down.
Because of gravity, you do not fall off the earth as it whirls (旋转) around.
Then, can we get away from the earth and go far out into space? Now you can do it, because
spaceships have been invented. Then the spaceship will go so fast that it can escape (逃出) the earth's
gravity and carry you into space.
( )1.The weight of the earth is called gravity.
2. A good high-jumper can jump three meters off the ground, can't he?
____________________________________________________
3. If the earth's gravity becomes smaller, will you become heavier or lighter?
____________________________________________________
4. Why can a spaceship escape the earth's gravity?
____________________________________________________
5. Put the underlined sentence in the passage into Chinese.
____________________________________________________
阅读理解
Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.
You can easily find out the pull of the earth. If you weigh (称体重) yourself, you will know how much gravity is pulling you.
Since there is gravity, water runs downhill. When you throw a ball into the air, it falls back down. Because of gravity you don't fall off the earth as it whirls (旋转) around.
Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. The spaceship will go so fast that it can escape (逃离)the earth's gravity and carry you into space.
(1) In this passage (文章), the word “gravity” means
[ ]
A. the pull of everything
B. the force (力) which attracts (吸引) the earth towards us
C. the force of attraction among things
D. the force which attracts things towards the center of the earth
(2) When you slip (滑倒)on something, you
[ ]
A. always fall down to the ground
B. sometimes fall down to the ground
C. go up into the air
D. often fall off the earth
(3) Gravity is so strong that ________
[ ]
A. it can't make you throw a ball into the air
B. it can keep everything on the earth
C. you can jump at least seven feet high
D. you can't go up into the air by spaceship
(4) Because of “gravity ”,________
[ ]
A. water flows (流) everywhere
B. we can go everywhere by ship
C. water flows downwards on the earth
D. water flows at the foot of hills
(5) We can get away from the earth by spaceship because
[ ]
A. the spaceship goes very fast
B. the earth has no gravity to the spaceship
C. the spaceship has a strange energy (能量)
D. the spaceship can go higher than any other thing on the earth
查看习题详情和答案>>Children have their own rules in playing games. They seldom need a referee
（裁判）and rarely trouble to keep scores. They don't care much about who wins or loses, and it doesn't seem to worry them if the game is not finished. Yet, they like games that depend a lot on luck, so that their personal abilities cannot be directly compared. They also enjoy games that move in stages, in which each stage, the choosing of leaders, the picking-up of sides, or the determining of which side shall start, is almost a game in itself.Grown-ups can hardly find children's games exciting, and they often feel puzzled at why their kids play such simple games again and again. However, it is found that a child plays games for very important reasons. He can be a good player without having to think whether he is a popular person, and he can find himself being a useful partner to someone of whom he is ordinarily afraid. He becomes a leader when it comes to his turn. He can be confident, too, in particular games, that it is his place to give orders, to pretend to be dead, to throw a ball actually at someone, or to kiss someone he has caught.
It appears to us that when children play a game they imagine a situation under their control. Everyone knows the rules, and more importantly, everyone plays according to the rules. Those rules may be childish, but they make sure that every child has a chance to win.
(1)What is true about children when they play games?
[
]A
．They can stop playing any time they like.B
．They can test their personal abilities.C
．They want to pick a better team.D
．They don't need rules.(2)To become a leader in a game the child has to ________.
[
]A
．play wellB
．wait for his turnC
．be confident in himselfD
．be popular among his playmates(3)What do we know about grown-ups?
[
]A
．They are not interested in games.B
．They find children's games too easy.C
．They don't need a reason to play games.D
．They don't understand children's games.(4)Why does a child like playing games?
[
]A
．Because he can be someone other than himself.B
．Because he can become popular among friends.C
．Because he finds he is always lucky in games.D
．Because he likes the place where he plays a game.(5)The writer believes that ________.
[
]A
．children should make better rules for their games.B
．children should invite grown-ups to play with them.C
．children's games can do them a lot of goodD
．children play games without reasons 查看习题详情和答案>>