Is there intelligent (有智力的) life on other pla...

Is there intelligent (有智力的) life on other planets? For years, scientists said “No” or “We don’t know.” But today this is changing. Seth and Alex are astronomers (天文学家). They believe intelligent life exists (存在) somewhere in the universe They also think we will soon communicate with these beings (人, 生物).

Why do seth and Alex think intelligent life exists on other planets? The first reason (理由) is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life.” say Seth and Alex. The second reason is size. The universe is huge. “We have known that there are at least 100 billion galaxies.” says Seth, “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar (相似的) to Earth.”

In the past. it was hard to look for signs (迹象) of intelligent life in the universe. But now, powerful telescopes (高倍望远镜) allow scientists to discover smaller planets—the size of Mars or Earth—in other solar systems. These planets might have intelligent life.

Have beings from space already visited Earth? “Probably not.” says Alex. “It’s a long way away. However, intelligent beings may communicate with us in other ways, such as radio signals (信号). In fact, they may be trying to communicate with us now, but we don’t have the right tools (工具) to receive their messages. However, this is changing. By 2025, we could communicate with other life forms in our universe and we might help each other.”

1.Seth and Alex think ________.

A. intelligent life exists somewhere in the universe

B. it was easy to look for signs of intelligent life in the universe in the past

C. beings from space have already visited Earth

D. we have the right tools to receive other intelligent life’s messages

2.Scientists believe ________ may be long enough for other planets to have intelligent life.

A. 100 billion galaxies

B. 100 billion stars

C. about 12 billion years

D. the huge universe

3.Why is it easy to look for signs of intelligent life in the universe now?

A. There are more smaller planets.

B. There are some powerful telescopes.

C. The astronomers are more interested in them.

D. The Milky Way exists now.

4.Why haven’t we received other intelligent beings’ messages according to Alex?

A. They may not want to communicate with us now.

B. They don’t know how to send radio signals to us.

C. There isn’t intelligent life on other planets.

D. We don’t have the right tools to receive their messages.

5.This passage mainly talks about ________.

A. the size of Mars or Earth

B. intelligent life on other planet

C. other solar systems

D. the Milky Way

八年级英语阅读单选中等难度题查看答案及解析

Scientists think that there has been life for__31_ of years. However we haven’t found life on other planets _32_ . The earth is a planet and it _33__ around the sun. Seven other planets also go _34_ the sun. The sun and its planets are __35  the solar system. The solar system is a small part of our galaxy.

Scientists __36_ lots of spacecraft to look at other planets in the solar system, and some spacecraft have gone __37_ the solar system. However, no one __38_ any life in space yet.

But why has no one from other planets sent us a message ? Have they tried to send _39_ to us ? _40_so many stars in the universe, are we alone, or is there life out there in space ? We don’t know.

八年级英语完型填空中等难度题查看答案及解析

Many people believe that, by the year 2100, we will live on the planet Mars(火星). Here is what life could be like.

First of all, transport should be much better . By 2100, spaceships can travel at half the speed of light. 1._______________________________.

Secondly , humans need food , water and air to live. Scientists should be able to find plants that can grow on Mars. These plants will provide us with food and air.

2.__________________________ .We could easily jump too high and fly slowly away into space. To prevent this , humans on Mars have to wear special shoes to make themselves heavier.

Life on Mars will be better in many ways. 3._________________________ .It is possible to live a large building with many bedrooms. Then , robots will do most of the work, so we have more time for hobbies.

4._________________________________ .Every student can study , do their homework on the computer and take exams in online schools. Each student will also have their own online teacher called “e--teacher”.

However , in some ways , life on Mars may not be better than that on the earth today. 5._____________________________________________ . Meals will probably be in the shape of pills (药片) and will not be as delicious as they are today. Also , space travel will make many people feel ill.

八年级英语补充句子简单题查看答案及解析

Scientists believe that in the future there ______ a planet for humans to live on.

A. is　　 B. will be　　 C. is going to have　　 D. won’t have

八年级英语单选题中等难度题查看答案及解析

完形填空

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

The earth is a planet and it 　 　　　　 　　 around the sun. Seven other planets also go around the sun. 　　　　 of them has an environment like that of the earth, so scientists do not think they will find life on them. The sun and its planets are called the solar system, and our solar system is a small part of a much larger group of stars and planets, 　　 　 　 the Galaxy or the Milky Way.

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

Scientists have sent spaceships to the planet Mars　　 　 　　 . They have even

sent spaceships to travel outside the solar system. However, no spaceship has travelled 　 　 to reach other stars in our Galaxy.

Scientists have always asked the questions: with so many stars in the universe, are we　 　 　　 , or is there life out there in space? Have there been visitors to the earth from other planets? Why has　　 　 communicated with us? We do no know the answers... yet.

1.A. have been　　 　 B. has been　　　 C. is　　　　　 　　 D. are

2.A. yet　　　　　　 　　 B. already　　　　 C. just　　　　 　　 D. ever

3.A. go　　　　　　　 　　 B. went　　　　　 　 C. goes　　　　 　　 D. going

4.A. no one　　　　 　　 B. neither　　　　 C. either　　 　　 D. none

5.A. called　　　　　 　 B. call　　　　　　 C. to call　　　 　 D. calls

6.A. what large　　 　 B. how small　　　 C. how large　　 　 D. how long

7.A. to take photos B. take photos　　 C. taking photos　 D. takes photos

8.A. enough far　　　 B. enough near　　 C. far enough　　 D. near enough

9.A. lonely　　　　　　 B. alone　　　　　 C. along　　　　　 　 D. alonely

10.A. someone　　　　 B. anyone　　　　 C. somebody　　 　 D. no one

八年级英语完形填空简单题查看答案及解析

1

Scientists think that there has been life on Earth for 1 (百万) of years. However, we haven’t found life on other 2 (行星) yet. The earth, the moon, and the sun are a small part of our galaxy. Scientists have 3 ( 发现) many other galaxies in the universe. And there are many books about the universe. I’ve just finished 4 (看) a great book at school. It is a book about the solar system. It is so good that I’ve5(已经) asked the library to keep the next book for6 (我). In the book, it says that astronauts have 7 (去) to Mars and even to Jupiter. I’ve never read that before. I’ve 8 (写信) to NASA to ask them for9 （更多）information about astronauts and space. I hope they will write 10 (回) soon.

八年级英语其他题困难题查看答案及解析

Scientists think that there has been life on Earth for _______ years.

八年级英语单项填空中等难度题查看答案及解析

Scientists think that there _____ life on Earth for millions of years.

A. has had　　 B. have had

C. has been　　 D. have been

八年级英语单项填空中等难度题查看答案及解析

Scientists think there has been life on Earth for _______ years.

A. millions of　　 B. hundreds of　　 C. five million of　　 D. million of

八年级英语单选题简单题查看答案及解析

Protect Mother Earth

In our solar system (太阳系), there is only one planet that is full of life. It is our Mother Earth.

Just like mothers take care of everything in homes, Mother Earth takes care of everything around the world. Do you know when Mother Earth’s birthday is? It is April 22, also known as the Earth Day. People around the world celebrate this day by making it very special for her. How do you think she will feel special? She will feel special if all of us love nature, keep it clean and use all of her seas, mountains and other natural resources in a right way.

Here are some other ways to keep her happy, healthy and smiling:

Walk or ride a bicycle. Cars, trains and planes make Mother Earth sick, because they make pollution.

Do not cut forests — animals’ home. Animals are children of Mother Earth like us.

Plant trees. Trees help keep the air clean.

根据短文内容，完成表格。

八年级英语填空中等难度题查看答案及解析