How much do you know about Earth—the planet that we live on? Our knowledge of Earth has been developing since ancient times. However, many puzzles (谜) about Earth remain unsolved. Live Science has published a list of the eight biggest mysteries about Earth. Let’s look at some of them.
Where did water come from?
When it first came into being 4.5 billion years ago, Earth was a dry rock. So where did all of our water come from? Scientists think that it might have arrived in the form of ice by an asteroid (小行星) from outer space that hit our planet. But this idea has not been confirmed (证明) because there is very little related evidence(相关证据) to be studied.
What’s in the core (地核)?
Scientists used to study meteorites (陨石) as small examples of Earth, believing that Earth’s core was made of iron and nickel (镍). However, a later study in the 1950s proved this way to be wrong because it found that Earth would be too light to provide gravity (引力) if its core contained only iron and nickel. Today, scientists continue to bring forward different ideas, but none have been confirmed.
How was the moon born?
Scientists have found that the chemical compositions (成分) of Earth and the Moon are very similar. That suggests that the Moon actually came from Earth. For example, it could be a piece of Earth that separated when Earth hit another planet. It is also possible that when Earth first came into being, it spun (旋转) very fast and threw off enough molten (熔化的) rock to later form the Moon.
1.What’s the main idea of the passage?
A.How Earth came into being.
B.Where Earth’s water came from?
C.How the moon was formed?
D.Unexplained mysteries about Earth.
2.What do we know about where water may come from?
A.Earth’s water may come from ice that melted 4.5 billion years ago.
B.Earth’s water may come from a small planet that hit Earth.
C.We don’t know where water came from.
D.There is lots of evidence that tells us where water came from.
3.What does the underlined phrase “bring forward” in Paragraph 5 probably mean?
A.Check B.Raise
C.Improve D.Receive
4.Which of the following is TRUE according to the passage?
A.Scientists used to believe Earth’s core was made of meteorites.
B.A study in the 1950s proved that Earth’s core is made of iron and nickel.
C.The moon and Earth are made of similar materials.
D.Three possibilities of where the Moon came from are mentioned.
九年级英语阅读单选中等难度题
How much do you know about Earth-the planet that we live on? Our knowledge of Earth has been developing since ancient times. However, many puzzles about Earth remain unsolved. Live Science has published a list of the eight biggest mysteries about Earth. Let's look at some of them.
Where did water come from?
When it first came into being 4.5 billion years ago, Earth was a dry rock. So where did all of our water come from? Scientists think that it might have arrived in the form of ice by an asteroid(小行星) from outer space that hit our planet. But this theory has not been confirmed because there is very little related evidence(相关证据)to be studied.
What's in the core(地核)?
Scientists used to study meteorites(陨石)as small examples of Earth, believing that Earth's core was made of iron and nickel(镍). However, a later study in the 1950s proved this way to be wrong because it found that Earth would be too light to provide gravity if its core contained only iron and nickel. Today, scientists continue to bring forward different theories, but none have been confirmed.
How was the Moon born?
Scientists have found that the chemical compositions(成分)of Earth and the Moon are very similar. That suggests that the Moon actually came from Earth. For example, it could be a piece of Earth that separated when Earth hit another planet. It is also possible that when Earth first came into being, it spun(旋转)very fast and threw off enough molten(熔化的)rock to later from the Moon.
1.What's the story mainly about?
A.How Earth came into being. B.Where Earth's water came from.
C.How the Moon was formed. D.Unexplained mysteries about Earth.
2.What do we know about where water may come from?
A.Earth's water may come from ice that melted 4.5 billion years ago.
B.Earth's water may come from a small planet that hit Earth.
C.We don't know where water came from.
D.There is lots of evidence that tells us where water came from.
3.What does the underlined phrase "bring forward" in Paragraph 5 probably mean?
A.Check. B.Raise. C.Improve. D.Receive.
4.Which of the following is TURE according to the passage?
A.Scientists believed Earth's core was made of meteorites.
B.A study in the 1950s proved that Earth's core is made of iron and nickel.
C.The Moon and Earth are made of similar materials.
D.Three possibilities of where the Moon came from are mentioned.
九年级英语阅读单选中等难度题查看答案及解析
How much do you know about Earth—the planet that we live on? Our knowledge of Earth has been developing since ancient times. However, many puzzles (谜) about Earth remain unsolved. Live Science has published a list of the eight biggest mysteries about Earth. Let’s look at some of them.
Where did water come from?
When it first came into being 4.5 billion years ago, Earth was a dry rock. So where did all of our water come from? Scientists think that it might have arrived in the form of ice by an asteroid (小行星) from outer space that hit our planet. But this idea has not been confirmed (证明) because there is very little related evidence(相关证据) to be studied.
What’s in the core (地核)?
Scientists used to study meteorites (陨石) as small examples of Earth, believing that Earth’s core was made of iron and nickel (镍). However, a later study in the 1950s proved this way to be wrong because it found that Earth would be too light to provide gravity (引力) if its core contained only iron and nickel. Today, scientists continue to bring forward different ideas, but none have been confirmed.
How was the moon born?
Scientists have found that the chemical compositions (成分) of Earth and the Moon are very similar. That suggests that the Moon actually came from Earth. For example, it could be a piece of Earth that separated when Earth hit another planet. It is also possible that when Earth first came into being, it spun (旋转) very fast and threw off enough molten (熔化的) rock to later form the Moon.
1.What’s the main idea of the passage?
A.How Earth came into being.
B.Where Earth’s water came from?
C.How the moon was formed?
D.Unexplained mysteries about Earth.
2.What do we know about where water may come from?
A.Earth’s water may come from ice that melted 4.5 billion years ago.
B.Earth’s water may come from a small planet that hit Earth.
C.We don’t know where water came from.
D.There is lots of evidence that tells us where water came from.
3.What does the underlined phrase “bring forward” in Paragraph 5 probably mean?
A.Check B.Raise
C.Improve D.Receive
4.Which of the following is TRUE according to the passage?
A.Scientists used to believe Earth’s core was made of meteorites.
B.A study in the 1950s proved that Earth’s core is made of iron and nickel.
C.The moon and Earth are made of similar materials.
D.Three possibilities of where the Moon came from are mentioned.
九年级英语阅读单选中等难度题查看答案及解析
We live on Earth. 1. Think about this, what if we lived on the other planet? Several years ago, many people believed we could live on Mars. 2. Let’s compare them and think about which planet is more suitable to live on.
The temperature on the surface of Mars is -73℃—20℃. 20℃ is suitable for humans, and -73℃ is near the average temperature of the Antarctic (南极), 3. And we have made a real trip to Mars. It would take 6 months to fly to Mars by spaceship. However, 4. Of course, humans can live through this by living in buildings, where plants could be grown and used to produce oxygen.
Scientists said that Kepler-452b is an Earth-like planet. Because it is only about 1.5 times the diameter of Earth, circling a star very much like our own Sun Although we don’t know if we can live there, it lies on the right distance where water could exist (存在). 5. But it is too far from us. Using present technology, it would take 25.8 million years to get there. So far, we’ve no hope of getting there.
A. so temperature isn’t a problem on Mars.
B. But until recently, a planet- Kepler452 b has been found by NASA (美国家航空航天局).
C. And water is important to lives on Earth.
D. But our Earth is becoming more and more crowded and polluted.
E. Mars is made up of 95% carbon dioxide, which is not suitable to humans.
九年级英语补全短文5选5中等难度题查看答案及解析
—Do you know ________?
—To protect our only home — the earth.
A.how we should live a green life B.why should we live a green life
C.what we should live a green life for D.whether we should live a green life
九年级英语单选题中等难度题查看答案及解析
—Do you know____________ —To protect our only home--the earth.
A.how we should live a green life B.why should we live a green life
C.why we should live a green life D.whether we should live a green life
九年级英语单选题中等难度题查看答案及解析
______ there any living things on other planets?
I have no ideas.Maybe we can know more about that in the future.( )
A.Is B.Are
C.Has D.Have
九年级英语单项填空中等难度题查看答案及解析
—Perhaps we will live on Mars some day.
—Then we can do anything can be done on the earth.
A. that B. which C. who
九年级英语单项填空中等难度题查看答案及解析
Thinking of ways to save Mother Earth? It’s high time we did, as the planet. we live on is suffering. Let’s look at some simple ways to save the environment.
Plant more trees.
Choose an open ground near your house and grow trees. Plant a tree every month and encourage your friends to join you. Plant more and more trees and then one day you’ll have an area of green land thanks to your hard work.
Save water.
Water is a very important natural resource . It’s we who waste it, pollute it. The simplest way to save water — turn off water taps after use. Use only as much water as necessary. Do not pollute rivers by throwing garbage or other waste material into them.
Recycle and reuse.
This is the best way to save the environment. A simple way to do this is to reduce the use of rubber and plastic.
Instead, use paper bags and cardboard boxes. Buy products that you can reuse. You can reuse your old clothes by donating them to the needy.
Save animals.
Reducethe use of animal products, like animal fur and ivory . Make yourself and those around you know the effects of animal extinction.(灭绝) Do your bit towards saving the endangered animals.
Some ways to 1.________________ | |
2._____ | Find an open ground near your house to grow trees |
Saving water | Turn off water taps after use Stop 3._________ rivers |
Recycling and reusing | use paper bags and cardboard boxes instead of 4.__________ Buy products that can be reused |
Save animals. | Reduce the use of animal products Make sure others__5._____ the effects of animal extinction |
九年级英语其他题中等难度题查看答案及解析
We all know that the gravity on Mars is only about _________ of __________ on Earth.
A. three-eighths; the one B. three-eighth; the one
C. three-eighths; that D. three-eighth; that
九年级英语单选题中等难度题查看答案及解析
阅读下面的短文并用英语回答问题,并将答案写在答题卡上标有题号的横线上。
How much do you know about "Taobao"? Do you often buy goods(商品)online? During every big festival hundreds of millions of dollars is spent online. "Who needs a shopping mall if you have Taobao? I am a Taobaoer," says Wang Fang, 28, a writer in Beijing. Taobao, China's largest online shopping site(场所),has become an important part of Wang Fang's life. Half of her salary(薪水)is usually spent on Taobao.
A growing number of Chinese Internet users like Wang have found the pleasure of online shopping. Most online shoppers are students and young workers. People can find almost everything they need online, from clothes to books, from candy to DVD players. And clothing and household(家用的)products are the most popular goods bought online.
The biggest attraction for buyers is the low prices of online goods. Buyers can also check the information easily. They can compare the prices of the same kind of goods from different sellers, and choose the cheapest one. When someone asks her about the safety of online shopping, Wang Fang said ,"It's very safe and easy. If you can't receive the goods from the sellers or are not satisfied with them, the shop owners will not get the money. You can also get your money back if you give the goods back. "
1.How much does Wang Fang spend on shopping online?
2.What do people like to choose online best?
3.Do you like doing some shopping on Taobao? Why or why not?
九年级英语任务型阅读困难题查看答案及解析