An Interesting Experiment

    Put an ice cube(冰块) from your fridge into a glass of water.{#blank#}1{#/blank#} Thus, you can take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.

    You may ask your friends to try to do that when you are having dinner together.{#blank#}2{#/blank#} You must use salt when you carry out this experiment.

    {#blank#}3{#/blank#} Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt.{#blank#}4{#/blank#} The cold ice cube will make the salt water freeze again.

    After a minute or two you may raise the piece of string and with it you will raise your piece of ice!

    This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice.{#blank#}5{#/blank#}

A. If you don't put enough salt, the water will freeze again.

B. The string must be at least 10 centimeters long.

C. First you put the string across the piece of ice.

D. We can learn a lot from this physical experiment.

E. But when it melts, it will lose heat.

F. You should have a piece of string 10 centimeters long.

G. There is a salt bottle on the table.

    Paul Lucas can often be seen walking around the city of San Francisco. Sometimes people are {#blank#}1{#/blank#} (surprise) to see him walking without any shoes or socks,{#blank#}2{#/blank#} Lucas doesn't mind at all. He likes to walk barefoot, and {#blank#}3{#/blank#} do 640 other members of Dirty Sole Society, the club that Lucas {#blank#}4{#/blank#} (start) years ago. Lucas' idea for this is to encourage others to live {#blank#}5{#/blank#} (free)－free of shoes.

    According to Lucas, the barefoot life has many {#blank#}6{#/blank#} (advantage). The most important is simply that it feels good. He also says that walking barefoot allows you to experience the world directly by {#blank#}7{#/blank#} (touch) it with your feet. In addition, the feet do not smell so much {#blank#}8{#/blank#} they stay dry,{#blank#}9{#/blank#} (make) it hard for bacteria(细菌)  to grow. And, of course, walking barefoot keeps your feet in good shape, so it's actually {#blank#}10{#/blank#} (healthy) than wearing shoes.

    People who like travelling have their reasons. They believe that travelling can help them expand their field of view, especially in the geographical and historical sense. They also think that touring will give them more chances to enjoy different kinds of food and experience new things that would never be brought by other activities. But those who dislike travelling also have some reasons.

    Travelling, in my opinion, does more good than harm. Most importantly, it broadens our mind. We can get in touch with other civilizations (文明), cultures, customs and ideas.

    Through history, most people travelled because of necessity (必要性)-not for pleasure. People travelled just in order to remain alive. They searched for food to eat or places to live in. They sometimes ran away from enemies. This is not to say that no one ever travelled just for the fun of it. In ancient times, for example, rich Romans travelled all the way to Greece to take part in the Olympic Games, and festivals. Of course, some people decided to travel just out of curiosity. They wanted to find out what it looked like beyond the horizon (地平线). Also business travel has been going on for centuries. Traders could not only make money but also learn to speak several languages and be introduced to different cultures.

    So, travelling does enrich our mind and draw new ideas to us. There is no doubt that we can get much from it.

    People who like travelling have their reasons. They believe that travelling can help them expand their field of view, especially in the geographical and historical sense. They also think that touring will give them more chances to enjoy different kinds of food and experience new things that would never be brought by other activities. But those who dislike travelling also have some reasons.

    Travelling, in my opinion, does more good than harm. Most importantly, it broadens our mind. We can get in touch with other civilizations (文明), cultures, customs and ideas.

    Through history, most people travelled because of necessity (必要性)-not for pleasure. People travelled just in order to remain alive. They searched for food to eat or places to live in. They sometimes ran away from enemies. This is not to say that no one ever travelled just for the fun of it. In ancient times, for example, rich Romans travelled all the way to Greece to take part in the Olympic Games, and festivals. Of course, some people decided to travel just out of curiosity. They wanted to find out what it looked like beyond the horizon (地平线). Also business travel has been going on for centuries. Traders could not only make money but also learn to speak several languages and be introduced to different cultures.

    So, travelling does enrich our mind and draw new ideas to us. There is no doubt that we can get much from it.

    People who like travelling have their reasons. They believe that travelling can help them expand their field of view, especially in the geographical and historical sense. They also think that touring will give them more chances to enjoy different kinds of food and experience new things that would never be brought by other activities. But those who dislike travelling also have some reasons.

    Travelling, in my opinion, does more good than harm. Most importantly, it broadens our mind. We can get in touch with other civilizations (文明), cultures, customs and ideas.

    Through history, most people travelled because of necessity (必要性)-not for pleasure. People travelled just in order to remain alive. They searched for food to eat or places to live in. They sometimes ran away from enemies. This is not to say that no one ever travelled just for the fun of it. In ancient times, for example, rich Romans travelled all the way to Greece to take part in the Olympic Games, and festivals. Of course, some people decided to travel just out of curiosity. They wanted to find out what it looked like beyond the horizon (地平线). Also business travel has been going on for centuries. Traders could not only make money but also learn to speak several languages and be introduced to different cultures.

    So, travelling does enrich our mind and draw new ideas to us. There is no doubt that we can get much from it.