B
It is natural that children are curious about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.
  As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.
  Scientists spend their lives trying to find out about the world.Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .
  These scientists have already discovered a lot about our world.For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.
  Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.
  We know a lot about our world, but there are still many answers that we do not have, and we are curious.
45.According to the passage, which of the following statements is true?
   A.People are curious in the same way.
   B.People in different countries are interested in different things.
   C.Men and women are curious about different things.
   D.People of different ages are interested in different things
46.Scientists who work with the biological sciences study____.
A.the earth , the oceans and the sky          B.man-made things
C.plants and animals                               D.ocean water
47.When you run, your muscles need ____.
A.more nutrition and oxygen    B.more signals    C.more salt   D.water
48.A rock cracks _____.
A.in wet regions                                     B.in dry regions
C.at very high or very low temperatures               D.when salty water falls in

It is natural that children are curious (好奇的) about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.
  As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.
  Scientists spend their lives trying to find out about the world. Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .
  These scientists have already discovered a lot about our world. For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.
  Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.
  We know a lot about our world, but there are still many answers that we do not have, and we are curious.
【小题1】According to the passage, which of the following statements is true?

A.People are curious in the same way.
B.People in different countries are interested in different things.
C.Men and women are curious about different things.
D.People of different ages are interested in different things
【小题2】Scientists who work with the biological sciences study____.
A.the earth , the oceans and the sky B.man-made things
C.plants and animals D.ocean water
【小题3】When you run, your muscles need ____.
A.more nutrition and oxygenB.more signals
C.more saltD.water
【小题4】A rock cracks _____.
A.in wet regions B.in dry regions
C.at very high or very low temperaturesD.when salty water falls in
【小题5】People are always curious because ____.
A.they cannot explain many thingsB.they know nothing about the world
C.they know little about the world D.they want to be scientists

As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. The they become interested in the physical world around them: the plants, the

animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.

Scientists spend their lives trying to find out about the world. Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .

These scientists have already discovered a lot about our world. For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.

Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty?”

Scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.

We know a lot about our world, but there are still many answers that we do not have, and we are curious. 

1.According to the passage, which of the following statements is true?

A.People are curious in the same way.

B.People in different countries are interested in different things.

C.Men and women are curious about different things.

D.People of different ages are interested in different things

2.Scientists who work with the biological sciences study____.

A.the earth , the oceans and the sky

B.man-made things

C.plants and animals

D.ocean water

3.When you run, your muscles need ____.

A.more nutrition and oxygen                B.more signals       C.more salt   D.water

 

HOW would you like to step into the world of other people’s dreams? That’s just what Dom Cobb (Leonardo DiCaprio) does. His work is to steal secrets from people when they are asleep and dreaming. He has an even rarer ability: He can plant an idea in someone’s sleeping mind, and watch it grow and take root in reality. This ability is called inception.

The movie Inception (《盗梦空间》) was on show in Chinese cinemas not long ago. It is imaginative, of course. The movie leads one to wonder just how much we know about dreams. For years, scientists and researchers have been trying to solve sleep’s greatest mystery.

Is it possible to enter someone’s dreaming mind? In the movie, DiCaprio uses a drug and a dream machine to put a scenario (某一特定情节) into someone’s sleeping mind. He then goes to sleep himself, connected to the machine, and enters the other person’s dream.

In real life, there is a machine that can read someone’s mind. A brain scanner takes pictures of brain activity, and then the software recreates images of what the person was looking at.

Researchers say it may be possible one day to record someone’s dream – without the danger (or the fun) of actually sharing that dream.

What’s a dream, anyway? A dream is a group of images and sounds our brain creates when we’re sleeping. In the 1950s, researchers discovered a sleeping condition that happened around every 90 to 120 minutes during sleep: rapid eye movement, or REM. During this period you’re fast asleep, yet your eyes move around quickly under your eyelids (眼皮) and your brain is nearly as active as during the day. That’s when most dreams happen.

What do dreams mean? Dreams are not always filled with meaning. Sometimes dreams are just your mind playing with thoughts and images from your life, or things you may have read or seen on TV. But at other times, dreams show things that you want to achieve in real life, or things that cause you trouble or stress.

1.The movie Inception is mentioned at the beginning of the article to ______.

       A. encourage readers to watch the movie

       B. tell readers about people with special dreaming abilities

       C. inform readers about the science of dreams

       D. warn reader about the threat of dream stealers

2.According to the article, how does a brain scanner work?

       A. It records dreams.

       B. It uses a special drug that causes no pain.

       C. It finds out what dreams mean.

       D. It takes pictures of brain activity and recreates images.

3. According to the article, which of the following statements about REM sleep is TRUE?

       A. Most dreams occur in REM sleep.

       B. Over the last ten years scientists have solved the mystery of REM sleep.

       C. People always remember what they have dreamed in a REM sleep.

       D. People can have REM sleep all night.

4. The article claims that ______.

       A. dreams tell us a lot about a person’s character

       B. dreams are connected to real life

       C. dreams are useful and help keep our brains active

       D. dreams are usually about meaningful things

 

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