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将500误写为50,此笔错账适用查找的方法是()。
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In fisheries in general, when a large harvest is taken one year, there will be fewer fish
A．learnB．heartC．earthD．heard
PART C
Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE.
听力原文： The sum total of our knowledge is very small compared to the size of our ignorance. Every advance on the frontier of knowledge opens up a great vista of the unknown. The scientist is not happy except when he finds something new. Science is an incomplete task just as life is incomplete. He can only be happy because he has the opportunity to continue the search. Fulfillment can never be there so long as knowledge is imperfect.
The search for truth is not a peaceful occupation. The happiest people I have known have not been the men of great worldly achievements or wealth. They have been the simple people who are happily married, enjoying good health and good family life.
I do not think we search for the stars or moon because we make up our minds to do so, but because we can't help ourselves. Imagination is not an attribute of happiness. A person can be very happy when he knows nothing.
While it is true you can get happiness peace and serenity from being at the lower end of the ladder, it is also true that you cannot enjoy the ecstasy of achievement. Success in the general sense of the term means the opportunity to experience and to realize to the maximum the forces that are within us.
In the author's opinion, why do we search the stars or moon？
听力原文： Not long ago it was assumed that the dangers man would meet in space would be terrible, the main ones being radiation and the danger of being hit by meteors. It is perhaps worth remembering that less than two centuries ago the dangers of train travel seemed similarly terrible. A man would certainly die, it was thought, if carried along at a speed of thirty kilometers per hour.
There are two sorts of radiation man must fear in space. The first is radiation from the sun, and this is particularly dangerous when the sun is very active and explosions are occurring on its surface. The second, less harmful form. comes from the so-called Van Allen Belts. These are two areas of radiation about 1,500 miles away from the earth. Neither of these forms of radiation area danger to us on the earth, since we are protected by our atmosphere. Specifically, it is that part of our atmosphere known as the ozonosphere which protects ns. This is a belt of the chemical ozone between 12 and 21 miles from the ground, which absorbs all the radiation.
Once outside the atmosphere, however, man is no longer protected, and radiation can be harmful in a number of ways. A distinction must be drawn between the short-and long-term effects of radiation. The former are merely unpleasant, but just because an astronaut returning from a journey in space does not seem to have been greatly harmed, we cannot assume that he is safe. The long-term effects can be extremely serious, even leading to death.
How many kinds of radiation are feared by astronauts？
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