In the science film Sunshine, an astronaut named Mace must leave his spacecraft without a protective suit for 15 seconds. He makes it through with the damage(损害) as a result of being very cold. Have you ever wondered what might happen to your body in space without a spacesuit?

On Earth, our atmosphere (air) protects us from the sun’s harmful UV rays, controls temperatures and also keeps a nice atmosphere pressure. The vacuum (真空) of space, however, is full of dangers.

One of the serious dangers Mace might face in outer space is ebullism (体液沸腾). The pressure in the vacuum of space is so low that the boiling point of the fluids (液体) in your body drops below the body’s normal temperature (37℃), which results in the formation of gas bubbles in your fluids that can really make you feel aching.

Another serious danger is the lack of oxygen. After around 15 seconds, your body would have used up all pf the oxygen in your body and you’d lose consciousness (意识). Some of you may be thinking “But I can hold my breath for minutes!?” The situation in space is a little different than here on Earth because of the lack of outside pressure, and if you held your breath in space without a suit you’d be in a big trouble. This is because any remaining air would rapidly enlarge, breaking the lungs.

After losing consciousness, you’ll probably last a couple of minutes at most before you die. Of course, there’s all that awful UV from the Sun which is going to give you serious sun burn, likely leading to cancer.

Is little damage for coldness a reasonable result of Sunshine’s suit less spacewalk? Actually it’s extremely cold in space, but astronauts wouldn’t immediately freeze because heat leaves the body very slowly in a vacuum. Therefore, the cold wouldn’t cause Mace too much harm in just 15 seconds, even if he faced the very lowest temperatures in space. The more likely damage would be caused from the enlargement and breaking of the skin’s small blood vessels (血管).

Anyway, obviously it’s never a good idea to go into space without some kind of protection. But don’t lose hope because you are probably saved with timely help before you die, so keep up!

1.Where can we read the passage?

A.In a magazine. B.In a diary.

C.In a movie poster. D.In a how-to book.

2.What does the writer think of the air or the vacuum?

A.The vacuum helps astronauts walking and Waving in space.

B.The air supplies living protection and temperature control.

C.The air brings people serious problems sometimes on Earth.

D.The pressure of vacuum in space increases the boiling point.

3.What is the purpose of writing this passage?

A.To encourage readers to watch the film Sunshine.

B.To show the readers many serious air problems.

C.To discuss the causes of cancer from the sunburn.

D.To explain the unreasonable damage in the film.

4.What is the best title of the passage?

A.Keep Alive in Space B.Walking Freely in Space

C.Without a Spacesuit D.Coldness Damage in Space

A young man worked very hard at his lessons. He was too busy to have a rest. At last, he became ill---he couldn’t go to sleep . Every night, when night, when he went to bed, he closed his eyes and tired to sleep. But he always stayed awake and couldn’t fall asleep.

After some days, he decided to see a doctor, “I just can’t go to sleep at night. What should I do ? Could you please help me?”

“I have a suggestion(建议),”said the doctor. “Try counting numbers. By the time you reach one thousand, you’ll be asleep. I’m sure of it.”

The next day the man returned to the doctor’s office. “Well,”said the doctor, “How are you today? Did you try my suggestion?”

The man still looked tired . “Yes,” he said , “I tired counting one, two, three--- up to one thousand. But when I reached five hundred and sixty-nine, I began to feel sleepy. I had to get up and drink some tea so that I could go on counting up to one thousand . But then I still couldn’t fall asleep.”

1.The young man couldn’t go to sleep because________.

A.he was worried about his work. B.he worked too hard and became ill.

C.he didn’t finish doing his lessons. D.There was a lot of noise and he couldn’t have a rest.

2.The doctor asked the young man________.

A.to put all numbers from 1 to 1,000 together B.to take some medicine and go to bed earlier.

C.to count numbers while he was lying in bed. D.to count numbers before he went to bed.

3.The young man________.

A.counted from 569 to 1,000 B.counted from 1 to 1,000 and fell asleep

C.counted from 1 to 569 and got up to drink some tea D.Counted from 1 to 569 and fell asleep

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