地球以外是否存在生命Is there intelligent life on other ...

地球以外是否存在生命

Is there intelligent life on other planets? For years, scientists said “No” or “We don't know”.　　 Although they thought so, today, this is changing. They, Seth Shostak and Alexandra Barnett, believe that there is intelligent life in somewhere in the universe.

Why do Shostak and Barnett think there is intelligent life on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. This is too long for only one planet in the whole universe to have intelligent life. The second reason is size—the universe is huge. Our galaxy (星系), the Milky Way, has at least 100 billion stars. Some planets that circle these stars might be similar to Earth.

Until recently, it was difficult to search for signs of intelligent life in the universe. But now, powerful telescopes (望远镜) allow scientists to identify (辨认) many more small planets—the size of Mars or Earth—in other solar systems.

Have life beings from space already visited Earth? “Probably not，” says Shostak，“The distance between planets is too great. In_fact,_they_could_be_trying_to_communicate_with_us_now. But we may not have the right tools to reply to their messages. But within the next 20 years, we could make contact with other life forms in our universe.”　

1题完成句子；2～3题简略回答问题；4题找出并写下第二段的主题句；5题将文中画线句子译成汉语。

1.Scientists Seth Shostak and Alexandra Barnett think there is _________ in the universe.

2.What are the two reasons that scientists think there is life existing in the universe?

________________________________________________

3.How do scientists search for signs of life in the universe?

____________________________________________________

4.____________________________________________________

5.____________________________________________________

九年级英语多任务混合问题中等难度题查看答案及解析

Is there intelligent life on other planets? For years， scientists said “no” or “We don’t know.” But today this is changing. Seth Shostak and Alexandra Barnett are astronomers. They believe intelligent life exists (存在) somewhere in the universe. They also think we will soon contact these beings.

Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life，” say Shostak and Barnet. The second reason is size—the universe is huge. “Tools like the Hubble telescope（哈勃望远镜）have shown that there are at least 100 billion galaxies，” says Shostak. “And our galaxy， the Milk Way， has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”

In the past， it was hard to look for signs 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 Shostak. “It’s a long way away. However， intelligent beings may contact us in other way， such as radio signs. In fact， they may be trying to communicate with us now， but we don’t have the right tools to receive their messages. However， this is changing. By 2025， we could make contact with other life forms in our universe and we might help each other.”

1.Seth Shostak and Alexandra Barnett are _______________.

A. astronomers.　　 B. farmers　　 C. singers　　 D. drivers

2.What is the best title for Paragraph Two?

A. The Age and Size of Earth

B. Our Galaxy： The Milk Way

C. Why Intelligent Life Might Exist

D. Earth： The Only Planet With Intelligent Life

3.Why was it hard to look for signs of intelligent life in the universe in the past?

A. There were not any smaller planets.

B. There were not any powerful telescopes.

C. The astronomers were not interested in them.

D. The Milk Way didn’t exist at that time.

4.Why haven’t beings from space visited us yet according to Shostak?

A. They are afraid of us.

B. It’s a long way away.

C. They don’t want to see us.

D. They don’t know how to use radio signs.

5.What does the underlined phrase “life forms” in the last paragraph mean?

A. Messages.　　　　 　　　　　 B. Tools.

C. Intelligent beings.　　　 D. Radio signs.

九年级英语阅读理解中等难度题查看答案及解析

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 Shostak and Alexandra Barnett are astronomers(天文学家). They believe intelligent life exists (存在) somewhere in the universe. They also think we sill soon contact these beings(人；生物).

Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life,” say Shostak and Barnett. The second reason is size—the universe is huge. “Tools like the Hubble Telescope(哈勃望远镜) have shown that there are at least 100 billion galaxies,” says Shostak. “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”

In the past, it was hard to look for signs 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 Shostak. “It’s a long way away. However, intelligent beings may contact us in other way, 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 to receive their messages. However, this is changing. By 2025, we could make contact with other life forms in our universe and we might help each other.”

1.Seth Shostak and Alexandra Barnett are _____.

A. astronomers　　　　　　　 B. farmers　　　　　　　　　　　 C. singers　　　　　　　　 D. drivers

2.What is the best title for Paragraph 2?

A. The Age and Size of Earth

B. Our Galaxy: The Milky Way

C. Why Intelligent Life Might Exist

D. Earth: The Only Planet with Intelligent Life

3.Why was it hard to look for signs of intelligent life in the universe in the past?

A. There were not any smaller planets.

B. There were not any powerful telescopes.　

C. The astronomers were not interested in them.

D. The Milky Way didn’t exist at that time,

4.Why haven’t beings from space visited us yet according to Shostak?

A. They’re afraid of us.　　　　　　　　　　

B. It’s a long way away.

C. They don’t want to see us.　　　　　　

D. They don’t know how to use radio signals.

5.What does the underlined phrase “life forms” in the last paragraph mean?

A. Messages　　　　 B. Tools　　　　　　 C. Intelligent beings　　　　　 D. Radio signals

九年级英语阅读理解中等难度题查看答案及解析

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 Shostak and Alexandra Barnett are astronomers(天文学家). They believe intelligent life exists (存在) somewhere in the universe. They also think we sill soon contact these beings(人；生物).

Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life,” say Shostak and Barnett. The second reason is size—the universe is huge. “Tools like the Hubble Telescope(哈勃望远镜) have shown that there are at least 100 billion galaxies,” says Shostak. “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”

In the past, it was hard to look for signs 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 Shostak. “It’s a long way away. However, intelligent beings may contact us in other way, 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 to receive their messages. However, this is changing. By 2025, we could make contact with other life forms　 in our universe and we might help each other.”

1.Seth Shostak and Alexandra Barnett are _____.

A. astronomers　　　　　 B. farmers

C. singers　　　　　　 　　 D. drivers

2.What is the best title for Paragraph 2?

A. The Age and Size of Earth

B. Our Galaxy: The Milky Way

C. Why Intelligent Life Might Exist

D. Earth: The Only Planet with Intelligent Life

3.Why was it hard to look for signs of intelligent life in the universe in the past?

A. There were not any smaller planets.

B. There were not any powerful telescopes.

C. The astronomers were not interested in them.

D. The Milky Way didn’t exist at that time,

4.Why haven’t beings from space visited us yet according to Shostak?

A. They’re afraid of us.

B. It’s a long way away.

C. They don’t want to see us.

D. They don’t know how to use radio signals.

九年级英语阅读理解中等难度题查看答案及解析

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 Shostak and Alexandra Barnett are astronomers(天文学家). They believe intelligent life exists (存在) somewhere in the universe. They also think we will soon contact (联系)these beings(人；生物).

Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life,” Shostak and Barnett said. The second reason is size—the universe is huge. “Tools like the Hubble Telescope(哈勃望远镜) have shown that there are at least 100 billion galaxies,” says Shostak. “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”

In the past, it was hard to look for signs 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 Shostak. “It’s a long way away. However, intelligent beings may contact 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 to receive their messages. However, this is changing. By 2025, we can communicate with other life forms in our universe and we might help each other.”

1.Seth Shostak and Alexandra Barnett are _____.

A. astronomers　　 B. farmers

C. singers　　　　　　 D. drivers

2.What is the best title for Paragraph (段落)2?

A. The Age and Size of Earth

B. Our Galaxy: The Milky Way

C. Why Intelligent Life Might Exist

D. Earth: The Only Planet with Intelligent Life

3.Why was it hard to look for signs of intelligent life in the universe in the past?

A. There were not any smaller planets.

B. There were not any powerful telescopes.

C. The astronomers were not interested in them.

D. The Milky Way didn’t exist at that time.

4.Why haven’t beings from space visited us yet according to Shostak?

A. They’re afraid of us.

B. It’s a long way away.

C. They don’t want to see us.

D. They don’t know how to use radio signals.

5.What does the underlined phrase “life forms” in the last paragraph mean?

A. Messages　　　　 　　　　　　　 B. Tools

C. Intelligent beings　　　　　 D. Radio signals

九年级英语阅读理解中等难度题查看答案及解析

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 Shostak and Alexandra Barnett are astronomers(天文学家). They believe intelligent life exists (存在) somewhere in the universe. They also think we sill soon contact these beings(人；生物).

Why do Shostak and Barnett think intelligent life exists on other planets? The first reason is time. Scientists believe the universe is about 12 billion years old. “This is long enough for other planets to have intelligent life,” say Shostak and Barnett. The second reason is size—the universe is huge. “Tools like the Hubble Telescope(哈勃望远镜) have shown that there are at least 100 billion galaxies,” says Shostak. “And our galaxy, the Milky Way, has at least 100 billion stars. Some planets going around these stars might be similar to Earth.”

In the past, it was hard to look for signs of intelligent life in the universe. But now, powerful telescopes 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 Shostak. “It’s a long way away. However, intelligent beings may contact us in other way, 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 to receive their messages. However, this is changing. By 2025, we could make contact with other life forms in our universe and we might help each other.”

1. Seth Shostak and Alexandra Barnett are _____.

A. astronomers　　　　 B. farmers　　　　　　 C. singers　　　　　 D. drivers

2.What is the best title for Paragraph 2?

A. The Age and Size of Earth.

B. Our Galaxy: The Milky Way

C. Why Intelligent Life Might Exist.

D. Earth: The Only Planet with Intelligent Life

3.Why was it hard to look for signs of intelligent life in the universe in the past?

A. There were not any smaller planets.

B. There were not any powerful telescopes.

C. The astronomers were not interested in them.

D. The Milky Way didn’t exist at that time.

4. Why haven’t beings from space visited us yet according to Shostak?

A. They’re afraid of us.

B. It’s a long way away.

C. They don’t want to see us.

D. They don’t know how to use radio signals.

5.What does the underlined phrase “life forms” in the last paragraph mean?

A. Messages　　　　　　 　　　　　 B. Tools

C. Intelligent beings　　　　　 D. Radio signals

九年级英语阅读理解中等难度题查看答案及解析

Is there intelligent life on other planets? For years，scientists said "no" or "We don't know". But today this is changing.　 Seth Shostak and Alexandra Barnett are astronomers. They believe intelligent life exists(存在)somewhere in the universe.　 They also think we will soon contact these beings.

Why do Shostak and Barnett think intelligent life exists on other planets?　 The first reason　 is time. Scientists believe the universe is about 12 billion years old. "This is long enough for other planets to have intelligent life，" say Shostak and Barnett. The second reason is size-the universe is huge. "Tools like the Hubble telescope(哈勃望远镜)have shown that there are at least 100 billion galaxies，" says Shostak. "And our galaxy，the Milk Way，has at least 100 billion stars. Some planets going around these stars might be similar to Earth."

In the past，it was hard to look for signs 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 Shostak. "It's a long way away. However, intelligent beings may contact us in other ways，such as radio signs. In fact，they may be trying to communicate with us now，but we don't have the right tools to receive their messages. However, this is changing. By 2025，we could make contact with other life forms in our universe and we might help each other. "

1.What is the best title for Paragraph Two?

A. The Age and Size of Earth

B. Our Galaxy: The Milk Way

C. Why Intelligent Life Might Exist

D. Earth: The Only Planet With Intelligent Life

2.Why was it hard to look for signs of intelligent life in the universe in the past?

A. There were not any smaller planets.

B. There were not any powerful telescopes.

C. The astronomers were not interested in them.

D. The Milk Way didn't exist at that time.

3.Why haven't beings from space visited us yet according to Shostak?

A. They are afraid of us.

B. It's a long way away.

C. They don't want to see us.

D. They don't know how to use radio signs.

4.What does the underlined phrase "life forms" in the last paragraph mean?

A. Messages.　　 B. Tools.

C. Intelligent beings.　　 D. Radio signs.

九年级英语阅读理解中等难度题查看答案及解析

（2017年山东德州） --______, there must be life on other planets though none has been discovered.

-- I agree with you. The universe is so large after all.

A. To my surprise　　 B. To be honest　　 C. In my opinion　　 D. Again and again

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. 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