What is the sky？ Where is it？ How bright is it？ What lies above it？ These questi - 初中英语试题 - 超级试练试题库

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What is the sky？ Where is it？ How bright is it？ What lies above it？ These questions are difficult to answer, aren’t they？
　　Is the sky blue？ The sky has no color. We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can’t fly very high because the air gets thinner when they go up higher. If we go up about 1,200 kilometers from the earth, we’ll find no air there.
　　When we talk about the sky, we usually mean the atmosphere around the earth. It is like a very thick “cover” over the earth and keeps it warm. Without the “cover”, the earth would be a very cold place and nothing could live on it.
　　Looking up above us, you will see the blue sky with white clouds. It is usually light blue, but the sky would be dark blue if you go to the top of the highest mountains. And you will see fewer clouds between you and the sun.
　　And if you sit in a spaceship high above the earth, there is no air at all. The sky would be so dark that its color would be black.
　　Sometimes the sky doesn’t look blue. When the sun rises and falls, you will see red, orange, and other colors in the sky. These are the most beautiful moments of the day.
　　Now you may understand that we see colors because the air scatters (散射) the sunlight. Light travels through the air. Without air, there would be no light and no colors.
小题1:Planes can’t fly very high because ____________.

A．there is air around the world

B．the air gets thinner when they go up higher

C．it’s warmer in the sky

D．the air gets thicker when they go up higher

小题2:We can see colors of the sky because ____________.

A．the sun rises and falls every day

B．the sky has lots of colors

C．the air scatters the sunlight

D．the sunlight has many colors

小题3:Which of the following is TRUE？

A．There is little air without light and colors in the sky.

B．The sky will look red, orange and other colors at noon.

C．The sky has only one color when the sun rises and falls.

D．The sky is dark blue if you go to the top of the highest mountains.

答案

小题1:B
小题2:C
小题3:D

解析

试题分析：在这篇短文里，讲述了为什么天空会呈现不同的颜色。那是因为空气散射光线的结果。例如越高空气越稀薄，在高山顶上看到天空是深蓝色，在太空看到天空是黑色的等。
小题1:细节理解题。文中第一段Planes can’t fly very high because the air gets thinner when they go up higher.飞机不能飞得太高，因为越高空气越稀薄，故选B。
小题2:判断推理题。文章最后一段Now you may understand that we see colors because the air scatters (散射) the sunlight. Light travels through the air现在你或许明白我们看到颜色是因为空气散射太阳光，而光线穿过空气。由此判断我们看到有颜色的天空是因为空气散射的原因，故选C。
小题3:判断推理题。文章第四段but the sky would be dark blue if you go to the top of the highest mountains.但是当你爬到最高山顶时，天空是深蓝色的，故判断D正确。

核心考点

试题【What is the sky？ Where is it？ How bright is it？ What lies above it？ These questi】；主要考察你对科普环保类等知识点的理解。[详细]

举一反三

The aim of students who come to school is to study. But to study requires a right way, or you waste either the time or the money. The following are the ways of studying.
The best time for reading is morning, because in the morning, the air is fresh and the mind is clear. For that reason, we can get good result.
In studying we must have patience. If we have not known a text well, we must read it again. We should not read the next one until we have learned the first one.
When we are studying, we must put our hearts into the book, or we can get nothing from the book while we are reading.
We must always ask “whys”. If it is not well understood, write it down and ask our teachers or our parents, or friends. In any possible way, we must know it completely and what we’ve learned can be used well and made better.
Though there are many ways for studying, yet the above mentioned will be quite enough if we can keep them in heart and do so.
根据短文内容回答下列问题。
小题1:What’s the main idea of the passage?
                                   .
小题2:When is the best time to read?
__________________________________________.
小题3:How many ways for studying are mentioned in the passage?
                                    .
小题4:Why must we always ask “whys” in our study?
                                    .

题型：不详难度：| 查看答案

Colorful hair speaks more about beauty. Now it becomes popular and people are dyeing their hair to make it different. Dyeing hair with natural products is good for health while dyeing with chemicals is harmful. Researches have found that dyeing hair with chemicals can make people have cancer.
　　Lead(铅)is very harmful for the human body and it is used in most hair dyes. Since the base of hair is the scalp(头皮)，you may have allergic reaction(过敏反应).
　　While dyeing your hair it is important to take some safety measures. You can follow them even when you are applying(涂) dye on your hair at home.
• It is better to apply hair dye for a few minutes. If you leave your hair with dye, longer than the necessary time，then you may get some skin problems.
• Don"t forget to wear gloves while applying dye on the hair. This will protect the skin of your
hands.
• After applying hair dye it is important to wash your hair with water.
• Hair dyes are made of chemicals. If you mix different hair dyes ,there may be chemical reaction. So, It is not a good idea to mix different hair dyes at the same time.
• Finally all the bags of hair dyes carry the directions(说明书 ) Try to follow them very carefully. This will lower the chance of allergic reaction.
小题1:What do most hair dyes contain?

A．Iron

B．Silk.

C．Lead

D．Gold

小题2:What does the underlined word "it" refer to?

A．Beauty

B．Health.

C．Blackhair.

D．Colorfulhair.

小题3:How can you make the chance of allergic reaction lower?

A．Dyewithchemicaldye.

B．Mixdifferenthairdyesatthesametime.

C．Leaveyourhairwithdyelonger.

D．Doasthedirectionstellyou.

小题4:From the passage，we can infer that _____

A．amanwhooftendyeshishairmayhavecancer

B．amanwhodoesn’tliketowashhairmayhavecancer

C．leadisgoodforthehumanbody

D．wemustn"tdyeourhair

小题5:What"s the main idea of the passage?

A．Howtodyeourhair.

B．Dyeinghairisharmful.

C．Tipsoilprotectingourhair.

D．Makeourhairmorebeautiful.

题型：不详难度：| 查看答案

DNA is the whole “map” of the human body. It is something that all human have, and it tells the body what to do. DNA is the reason that we look like our parents, because we get some of their DNA to make our own.
People have been trying to understand the human body for a long time. In 1860, Mr. Mendel discovered why we look the same as other people in our family. It is because of small things called “genes”(基因) in our body. In 1953, two scientists, Watson and Crick, found out that those small parts are really messages. They’re written in the DNA with a special language.
In 1961, another two scientists found the first “word” that they could understand in that language. It shows how DNA tells the cell(细胞) to build its parts. So far, scientists have found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one “word” means, we can help to save people from several illnesses. So the more we understand, the more doctors will be able to do.
Most people hope that this will help to make better medicine and help sick people. Other people worry that when we learn more “words” and and find out more information, we will use it in the wrong way, just to make people more attractive, or stop sick people getting jobs.
小题1:When did Mr. Mendel discover why we look the same as other people in our family?

A．In 2000

B．In 1961.

C．In 1953

D．In 1860

小题2:What did the two scientists find in 1961? They found ________.

A．all the words in the DNA map

B．small things called “genes” in our body

C．the first “word” they could understand in that language

D．those small parts are written in the DNA with a special language.

小题3:How can we help sick people if we understand more “words” in the DNA map?

A．Make better medicine.	B．Make they get jobs.
C．Make maps for them.	D．Make them attractive.

小题4:Which one is NOT TURE according to the article?

A．We look like our parents because of “genes” in our body.

B．We have understood what all the words in the DNA map do.

C．DNA is the whole “map” of the human body.

D．DNA tells the cell to build its parts.

小题5:What do people think about this research about DNA?

A．It can be only bad.	B．It can be only good.
C．It can be good but won’t work.	D．It can be good and bad.

题型：不详难度：| 查看答案

Everyone needs friends. We all like to ______close to someone. ______ is nice to have a friend to talk with, laugh at , and do things with. ____, sometimes we need to be alone. We don"t always want people_______ . But we would feel lonely if we _______had a friend.
No two people are______. Friends_____ don"t get on well. That doesn"t mean_____ they no longer like each other. Most of the time they will make up and become ____ again.
Sometimes friends move away. Then we feel very ______.We miss them very much, but we can ______them and write to them. It could be that we could even see them again. And we can______new friends. It is surprising to find out _____ we like our new friends when we get to know them.
There’s more good news for people who have friends. They live longer than people who don"t. Why? It could be that they are ______ . Being happy helps people stay well. Or it could be just knowing that someone cares. If someone cares about you, you take _______care of yourself.

小题1:

A．look

B．watch

C．feel

D．see

小题2:

A．It

B．He

C．There

D．Someone

小题3:

A．Hardly

B．Nearly

C．Suddenly

D．Certainly

小题4:

A．alone

B．away

C．all over

D．around

小题5:

A．ever

B．never

C．just

D．really

小题6:

A．friendly

B．kind

C．just the same

D．quite different

小题7:

A．always

B．sometimes

C．often

D．usually

小题8:

A．that

B．whether

C．how

D．why

小题9:

A． friendly

B．good

C．pleased

D．friends

小题10:

A．angry

B．sad

C．happy

D．alone

小题11:

A．call

B．ask

C．tell

D．talk with

小题12:

A．look for

B．find

C．make

D．know

小题13:

A．how often

B．how long

C．how many

D．how much

小题14:

A．happier

B．stronger

C．kinder

D．richer

小题15:

A．less

B．better

C．little

D．no

题型：不详难度：| 查看答案

Ladies and gentlemen, I returned to this year in a time machine. In the year 2500, we are able to travel through time to any year in the history of the earth. This year is your last chance your lifestyle to save the earth.
Beginning in the middle of the 20^th century, a few people were worried about polluting the earth’s water and air, but most people did not change their way of life. Instead, they continued to pour(倒) dangerous chemical(化学物品) and other waste into lakes and seas, to drive more and more cars and trucks, and to cut down trees.
By the year 2200, the earth’s water was completely polluted. People could no longer drink water, and they had to use other types of liquids(液体). Scientists said that in the future there might be too many people on the earth. But not enough was done.
So by the year 2300, there were so many people that food became scarce. There was no water to grow food and all of the fish in lakes and seas died because of pollution. Terrible wars broke out between the rich and the poor. Scientists were working very hard to find another planet in space where humans could live.
By the year 2400, the air was too polluted for humans to breathe. So we had to leave the earth. But only the rich were able to leave. Where did we go? Nowhere. And everywhere. You see scientists did not find another safe planet, so now we must travel around the universe in our space ships. We are still looking for a place to call our home.
So it is up to you to change history. There is still hope. You must change your lifestyle now, before it is too late.
小题1:Which problem is NOT talked about in Paragraph 2?

A．Water

B．Air

C．Lifestyle

D．Food

小题2: The underlined word ‘scarce’ means ‘______’ in Chinese.

A．昂贵的

B．充足的

C．缺乏的

D．特殊的

小题3:Which of the following is NOT true?

A．Only a few people changed their lifestyle in the 20^th century.

B．There was no clean water for people to drink by the year 2200.

C．All the fish died because of the pollution by the year 2300.

D．We found a new home in another planet by the year 2400.

小题4:What’s the best title of the passage?

A．Stop polluting	B．Change or leave
C．Look for new home	D．Return to the earth

题型：不详难度：| 查看答案

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