More and more people around the world are joining in dangerous sports. Some people climbed the highest mountains; some traveled into unknown parts of the world; some sailed small boats across the largest sea. Now some people begin to look for new excitement.

Bungee jumping (蹦极) and motorcycle racing (摩托车赛) are quite dangerous sports. Bungee jumping only lasts for a few minutes or even seconds. You jump from a high place, about 200 meters above the ground, and there is a rubber band (橡胶带子) tied to your legs. When you jump down, the rubber band pulls you up. About 2,000,000 people around the world have tried bungee jumping.

Why do people join in these dangerous sports Some scientists say that it is because modern life has become safe and it is not interesting. In the past, people lived in danger. They had to go out and look for food, and life was like a fight but was interesting.

Many people think that there is little excitement in life. They live and work in safe places, buy food in shops, and there are doctors and hospitals to look after them if they become ill.

根据短文内容,选择正确答案。

1.People like to join in dangerous sports because _______.

A.they have a lot of free time

B.they can go to the hospital if they are hurt

C.they need excitement

D.they don’t need to look for food

2. _______ is not a dangerous sport.

A.Climbing the highest mountains

B.Playing table tennis

C.Traveling into unknown parts of the world

D.Sailing small boats across the largest sea

3.In bungee jumping, you _______.

A.jump up as high as you can

B.jump down with a rubber band tied to your legs

C.jump down without a rubber band

D.jump to the ground

4.In the past, people lived in danger because _______.

A.the living condition (生存条件) was poor

B.there was no doctor or hospital

C.there were many dangerous animals

D.all of above

5.Which is NOT true

A.Everyone’s life is interesting.

B.Many people live and work in safe places.

C.Many people buy food in shops.

D.People can go to see the doctors when they become ill.

Answer the questions (根据短文内容回答问题)

Scott Kelly, an American astronaut, returned to earth on March 2, 2016. He was taller by nearly 1.5 inches (3.81 cm) when he landed on Earth after his 340-day space mission on the International Space Station (ISS).

His change in height, which lasted about two days, raised the question: What are the effects of a long-term stay in space?

As you probably know, there is no gravity in space. This not only causes difficulties in everyday actions like eating, walking and sleeping, but also problems for the human body.

The first problem is the air. Without gravity, carbon dioxide cannot spread during breathing, but gathers around the body and causes headaches. More than that, human feelings of movement are affected, which could make people feel sick.

The body’s fluids(液体) don’t work well in weightlessness, making blood flow upward instead of down to the lower legs, and astronauts’ faces become fatter than normal. Gaps between bones also become larger because humans cannot stand up straight. The spine(脊柱) can also get bigger in zero gravity.

In addition, human bodies become weaker because of the lack of gravity and space to move around in. Some astronauts said that after they returned, their muscles hurt and their skin became very sensitive(敏感的). Kelly said during his first press conference, “It was almost like my body was on fire wherever I sat or lay or walked.”

However, the research into the effects of long-term space flight on human bodies and minds never stops. There are many actions that astronauts can take in space. They can take vitamin D for bone growth, wear special belts on their legs to keep blood in their lower bodies and do strength coaches’ exercises. The fans in the ISS also help spread carbon dioxide around. “We will do further research.” NASA Administrator Charles Bolden said, “I believe it will be meaningful to human-being.”

1.Something occured to Kelly’s body when he finished his space mission, didn’t it?

2.People may _____________, if carbon dioxide cannot spread during breathing.

3.What will happen to astronauts’ faces in space?

4.Why did Kelly feel burned when he was sleeping according to the text?

5.What can astronauts do to keep fit in space?

6.Do you agree that the research is meaningful to human-being? Why?

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