Around the world more people are taking part in dangerous sports and activities. Now, there are people who look for an immediate excitement from a risky activity which may only last a few minutes or even seconds.
I would consider bungee jumping (蹦极) to be a good example of such an activity. You jump from a high place 200 meters above the ground with an elastic (弹性的) rope tied to your feet. You fall at up to 150 kilometers an hour until the rope stops you from hitting the ground. It is said that about 2 million people around the world have now tried bungee jumping. Other activities which most people would say are as risky as bungee jumping include jumping from tall buildings and diving into the sea from the top of high cliffs.
Why do people take part in such activities as these Some psychologists suggest that it is because life in modem societies has become safe and boring. Not very 10ng ago, people’s lives were constantly in danger. They had to go out and hunt for food, diseases could not easily be cured, and life was a continuous battle for survival.
Nowadays, according to many people, life offers little excitement. They live and work in quite safe conditions: they buy food in shops, and there are doctors and hospitals to look after them if they become ill. The answer for some of these people is to look for danger in activities such as bungee jumping.

A:About 200,000 people in the world have tried bungee jumping. B:In order to keep one safe, a rope is tied to feet of the jumping. C:Diving into the sea from the top of the cliffs is much more dangerous than bungee jumping. D:Many people nowadays feel life dull because they haven’t tried bungee jumping.

The murderer was brought in, with his hands______behind his back.

A:being tied B:having tied C:to be tied D:tied

The murderer was brought in, with his hands ______ behind his back.

A:being tied B:having tied C:bo be tied D:tied

The murderer was brought in, with his hands_____ behind his back.

A:to have been tied B:having tied C:to be tied D:tied

Glaciers are a possible source of fresh water that has been overlooked until recently. Three quarters of the Earth’s fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain all the rivers of the world for 1,000 years. Floating on the oceans are 7,659 trillion metric tons of ice encased in 10,000 icebergs that break away from the polar ice caps, more than ninety percent of them from Antarctic

A:a. B:How much fresh water is tied up in glacial ice 75 % of the Earth’s fresh water supply. 90% of the Earth’s fresh water supply. Enough to support human beings for 1,000 years. As much as the water from 10,000 trillion metric tons of ic

Around the world more people are taking part in dangerous sports and activities. Now, there are people who look for an immediate excitement from a risky activity which may only last a few minutes or even seconds.
I would consider bungee jumping (蹦极) to be a good example of such an activity. You jump from a high place 200 meters above the ground with an elastic (弹性的) rope tied to your feet. You fall at up to 150 kilometers an hour until the rope stops you from hitting the ground. It is said that about 2 million people around the world have now tried bungee jumping. Other activities which most people would say are as risky as bungee jumping include jumping from tall buildings and diving into the sea from the top of high cliffs.
Why do people take part in such activities as these Some psychologists suggest that it is because life in modem societies has become safe and boring. Not very 10ng ago, people’s lives were constantly in danger. They had to go out and hunt for food, diseases could not easily be cured, and life was a continuous battle for survival.
Nowadays, according to many people, life offers little excitement. They live and work in quite safe conditions: they buy food in shops, and there are doctors and hospitals to look after them if they become ill. The answer for some of these people is to look for danger in activities such as bungee jumping.

A:About 200,000 people in the world have tried bungee jumping. B:In order to keep one safe, a rope is tied to feet of the jumping. C:Diving into the sea from the top of the cliffs is much more dangerous than bungee jumping. D:Many people nowadays feel life dull because they haven’t tried bungee jumping.