Scientists think that there has been life on ...

Scientists think that there has been life on the earth for hundreds of millions of years. However, we haven't found life on other plants yet. Why not?

The Earth is a planet and it goes around the Sun. Seven other planets also go around the sun. None of them has an environment with air, so people and living things cannot grow. The Sun and its planets are called the solar system(太阳系). The solar system is a small part of our galaxy（星系）.

But scientists have discovered many other galaxies in the universe. But they are far away and their light has to travel for many years to reach us. It is hard to understand how large the universe is.

So far, scientists have sent lots of spaceships to look at other plants in our solar system, and some spaceships have gone beyond the solar system. However, no one has discovered any life in space yet.

But why has no one from other plants sent us a message? Have they tried to send information to us? With so many stars in the universe, are we alone, or is there life out there in space? We don't know yet.

1.How many planets go around the sun?

A.Seven B.Eight C.Nine D.Ten

2.In order to look at other planets in the solar system, scientists have sent many________.

A.e-mails B.planes C.spaceships D.messages

3._______ has found life on other planets.

A.No one B.A scientist C.A traveler D.A student

4.Which of the following is TRUE?

A.All the planets have an environment with air. B.It’s easy to know how large the universe is.

C.There is only one galaxy in the universe. D.The solar system includes the sun and its planets.

5.The best title of this passage should be ________.

A.The Moon B.The Solar System C.The Stars at Night D.The Sun

九年级英语阅读单选中等难度题查看答案及解析

阅读短文，完成各题。

Scientists think that there has been life on the earth for hundreds of millions of years. However, we have not found life on any other planets yet.

The earth is a planet and it goes around the sun, which is a star. Seven other planets also go around the sun. None of them has an environment like that of the earth, so scientists do not think they will find people and things on them. The sun and its planets are called the solar system (太阳系). The solar system is a small part of our galaxy (星系). There are billions of stars in the Galaxy, and our sun is only one of them.

Scientists have also discovered many other galaxies in the universe (宇宙). They are very far away and their light has to travel for many years to reach us. So how large is the universe? It is impossible to imagine.

Scientists have sent spaceships to the planet Mars (火星) to take photos. They have even sent spaceships to travel outside the solar system. However, no spaceship has travelled far enough to reach other stars in our Galaxy.

Scientists have always asked questions: with so many stars in the universe, are we alone, or is there life out there in space? Have there been visitors to the earth from other planets? Why has no one communicated with us? We do not know the answers… yet.

根据短文内容，判断下列句子正误。正确的用“A”表示，不正确的用“B”表示。

1.There are eight planets in the solar system.

2.There is more than one galaxy in the solar system.

3.The light from the stars in other galaxies has to travel for a long time to reach the earth.

4.Spaceships have visited most of the universe.

5. Scientists have received many messages from space.

九年级英语阅读理解中等难度题查看答案及解析

阅读下面的短文，根据文中信息完成文后表格。（每空一词）

Scientists think that there has been life on the Earth for hundreds of millions of years.

However, we have not found life on any other planet yet.

The Earth is a planet and it goes around the Sun. Seven other planets also go around the Sun. None of them has an environment like that of the Earth, so scientists think there may be no life on them. The Sun and its planets are called the solar system (太阳系), and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way. There are many, many stars in the Galaxy, and our Sun is only one of them.

Scientists have also discovered many other galaxies in the universe (宇宙). They are very

far away and their light has to travel for many years to reach us. So how large is the universe? It is impossible to imagine.

Scientists have sent spaceships to the planet Mars to take photos. They have even sent spaceships to travel outside the solar system. However, no spaceship has travelled far enough to reach other stars in our Galaxy.

Scientists have always asked the questions: with so many stars in the universe, are we alone, or is there life out there in space? Have there been visitors to the Earth from other planets? Why has no one communicated with us? We do not know the answers yet.

九年级英语任务型阅读困难题查看答案及解析

The ______ that there is life on other planets has always encouraged scientists to explore the outer space.

A.possibility B.order C.advice D.information

九年级英语单选题中等难度题查看答案及解析

The_____that there is life on other planets has always encouraged scientists to explore the outer space.

A. possibility B. order C. advice D. information

九年级英语单选题中等难度题查看答案及解析

The ____________ that there is life on other planets has always encouraged scientists to explore the outer space.

A.invitation B.possibility C.order D.advice

九年级英语单选题中等难度题查看答案及解析

Scientists think life on Mars will be better than _____on Earth _____ many ways.

A. the one, on　　 B. that, on　　

C. that, in　　 　　 D. the one, in

九年级英语单项填空简单题查看答案及解析

Scientists think life on Mars will be better than _____on Earth _____ many ways.

A. the one, on　　 B. that, on　　

C. that, in　　 　　 D. the one, in

九年级英语单项填空中等难度题查看答案及解析

Scientists think life on Mars will be better than _____on Earth _____ many ways.

A. the one, on　　 B. that, on

C. that, in　　 D. the one, in

九年级英语单项填空简单题查看答案及解析

The question whether there is life on Mars (火星) has made the public think a lot for more than a century. The closest look showed Mars to be a dusty, cold world, covered by air too thin to breathe. A British spaceship and Europe's Mars spaceship plan to land on Mars or enter orbit (轨道) around it. One of the NASA’s (美国宇航局) spaceships is expected to land on January 3, the other is going to land on the opposite side of Mars on January 24. Since 1960, over twenty spaceships sent to Mars have failed. Most have been lost on flying up or landing because those are the most difficult times of any flights.     Scientists wanted to find out whether there was water in Mars. In October, a team of scientists reported that Mars had been a dry wasteland. But weeks later, a second team reported differently that they had found some marks showed clearly that they were made by the rivers. Such marks told us that Mars was a warmer place billions of years ago — just as life first appeared here on Earth. Scientists at once raise a question: if what they said is true, what happened on Mars? Then what about the earth?

1.Which is right about Mars?

A．It’s cold without dust.

B．There is no water or air.

C．It’s warm with some thin air.

D．It’s a dusty, cold world almost without air.

2.Two NASA’s spaceships _______________.

A．will land on the different sides of Mars

B．will land on the same day

C．will enter orbit around Mars

D．will land with a man

3.The most difficult times of a flight are _______________.

A．taking off

B．flying up and arriving

C．entering the orbit and landing

D．leaving the earth and entering the orbit

4.A team of scientists reported that there might be_____________ in Mars.

A．nothing but air

B．nothing

C．water billions of years ago

D．thick air and lakes

5.What are scientists worried about when they raise the question?

A．Life disappeared on Mars.

B．Spaceships can’t land on Mars.

C．The air on the earth gets less and less.

D．The earth might be changed like Mars

九年级英语阅读理解中等难度题查看答案及解析