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经济发展水平不同的国家之间进行的贸易,被称为()。
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What is the news item mainly about？
听力原文： Because we can feel that things are heavy, we think of weight as being a fixed quality in an object, but it is not really fixed at all. [18]If you could take a one pound packet of butter 4,000 miles out from the earth, it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space？ [19]The reason is this: All objects have a natural attraction for all other objects; this is called gravitational attraction, but this power of attraction between two objects gets weaker as they get farther apart. When the butter was at the surface of the earth, [20]it was 4,000 miles from the centre, in other words the radius of the earth is 4,000 miles. When we took the butter 4,000 miles out, it was 8,000 miles from the centre, which is twice the distance. If you double the distance between two objects, their gravitational attraction decreases four times weaker. If you treble the distance, it gets nine times weaker. If you take it four times as far away, it gets sixteen times weaker and so on.
If an object weighed one pound on the surface of the earth, how much would it weigh 4,000 miles above the earth？
How were the police able to prove that Joe had robbed the bank？
Part A
Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D . Mark your answers on ANSWER SHEET 1.
"All work and no play makes Jack a dull boy" is a popular saying in the United States. Other countries have similar sayings. It is tree that all of us need recreation. We cannot work all the time if we are going to maintain good health and enjoy life. Good physical and mental health in fact enables us to work more efficiently.
Everyone has his own way of relaxing. Perhaps the most popular way is to participate in sports. There are team sports, such as basketball, baseball, and football. There are also individual sports, such as golf and swimming. In addition, hiking, fishing, skiing and mountain climbing have a great attraction for people who like to be outdoors, Chess, card-playing, and dancing are forms of indoor recreation enjoyed by many people.
Not everyone who enjoys sporting events likes to participate in them. Many people prefer to be spectators, either by attending the games in person, watching them on television, or listening to them on the radio. When there is an important baseball game or boxing match, it is almost impossible to get tickets. Everyone wants to attend.
It doesn't matter whether we play a fast game of ping-pong, concentrate over the bridge table, or go walking through the woods on a brisk autumn afternoon. It is important for everyone to relax from time to time and enjoy some form. of recreation.
What does the saying "All work and no play makes Jack a dull boy" really mean？
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