题目

下列变化过程中，共价键被破坏的是   A  烧碱溶于水            B  氯化氢气体溶于水   C  二氧化碳变成干冰      D  碘溶于酒精 答案：B五、阅读理解。Someday you may go to the Moon. A tall rocket (火箭) will take you into space. The rocket flies a long way to a space station. You will stop there for a short time. Then a big spaceship will take you to the Moon.About three days later,the ship will go down slowly and get on the Moon. You will be on the Moon,but you won’t leave your spaceship. You must put on a space suit on the Moon. It is very hot in the day and very cold at night. If you don't wear the space suit,you won’t live there. You will jump out of the spaceship and begin to walk. The Moon is much smaller than the Earth. The things on the Moon are much lighter than (比......轻) those on the Earth.You will jump high in the air every time you take a step.The Moon moves slowly,so one day on the Moon is as long as two weeks on the Earth and one night is just as long as two weeks on the Earth. It never rains on the Moon,and everything on the Moon is dry. There are no trees or other living things of any kind. There is nothing to do there. The Earth is a better place to live on,but scientists are trying to make the best use of the Moon.() 1. — How can you go into space?—By .   A. plane   B. spaceship   C. rocket   D. space suit() 2. How can you get on the moon?   A. By rocket I can into space.   B. It will take me a long time to get to the moon by rocket.   C. The rocket will take me to the space station and by spaceship I will get there.   D. A and   C.() 3. Which is right?   A. Days are longer but nights are shorter on the moon.   B. Days are shorter but nights are longer on the moon.   C. Days are shorter than nights on the moon.   D. 28 days on the earth is as long as two days on the moon.() 4. There is no life on the Moon because.   A. the Moon moves very slowly   B. there is no water   C. night is hotter but day is colder   D. the Moon is much smaller than the Earth() 5. On the Moon,it rains.   A. sometimes   B. always   C. often   D.never