We have always been interested in the moon.2000 years ago people already knew it moved around the earth and where it would be in the sky at different times of the year.At that time, everything about the moon was learned by watching it carefully in the sky.

When scientists could use telescopes to study the moon more closely, their ideas began to change.They could see the moon was made of rocks.Most scientists thought moon rocks would be different from those on Earth.This was because they believed the moon had once been a planet that had been caught in the earth's gravity (引力) millions of years earlier.

In 1969 moon rocks were finally brought to the earth and studied.Much to their surprise, scientists found that, except for water, the moon and the earth were made of the same things.Once again new ideas were needed for this new information.

After years of study, most scientists now think that the moon was once part of Earth.They believe very early in its history, maybe 4 million years ago, something about the size of Mars hit Earth.This sent billions of rocks into space around our planet.These rocks slowly joined together and after many years became the moon.

In the future, even though our ideas about the moon may change again, we will still be interested in it.

1.Now, we’re sure ________________

A.Moon rocks are quite different from those on Earth.

B.Moon was once a part of Earth.

C.Moon moves around Earth and it’s the only satellite of Earth.

D.Moon was once a planet caught in Earth’s gravity.

2.In 1969 there is a big event, that is __________.

A.humans Found no water in Moon rocks

B.scientists made out a modern spaceship

C.scientists invented an advanced telescope

D.humans left their footprints on Moon

3.What does the writer want to tell us in the passage?

A.Why people are interested in the moon.

B.How ideas about the moon have changed over time.

C.Where the moon came from in the past.

D.That people have finally learned the truth about the moon.

4.Before 1969 most scientists thought the moon was ________.

A.part of the earth billions of years earlier

B.older than the earth

C.a planet caught by the earth's gravity

D.made of the same things as the earth

5.From this passage we can learn that ________.

A.scientists in the past were not clever

B.the earth was once part of the moon

C.new information brings new ideas

D.we now know everything about the moon

Where do you think people will live in the future? Can you imagine people will work and live in the sea? But how will people go to work then? By submarine( 潜 水 艇)?

Some scientists believe that some day submarines will be as many as today’s cars. A famous French driver says, “One day, people will work on the ocean floor as they do on the street!”.

If people want to live in the sea, they have to solve a lot of problems, like those of living on the moon such as lack( 缺 少 ) of oxygen and weightlessness( 失 重 ). Many problems are hard to solve. For example, what will happen to our bodies if we live in the sea for a very long time? Scientists are looking for answers.

Maybe in 50 years people will be able to live in the sea, away from the noisy cities on land. They will find it fun and interesting to live in the sea. And life in the sea is more comfortable. Don’t you think so?

1.Maybe people in the future will to work on the ocean floor.

A.drive a car B. take a bus C.take a submarine D.swim

2..What problem will people have if they live in the sea?

A.They will feel cold.

B.They will feel tired.

C.They will become quite heavy.

D.They will have difficulty in breathing.

3.The writer thinks living in the sea is than living on land.

A.better B.worse C.easier D.noisier

4.Which of the following is NOT true according to the passage?

A.People may be weightless in the sea.

B.The sea is noisy and crowded for man to live.

C.Some scientists believe submarines will be popular in the future.

D.There are some problems to solve if people want to live in the sea.

5.What's the best title of the article?

A.Living in the Sea B. Living in Submarines

C. Living on Land D. Living on the Moon

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