英语四级

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专业英语四级考试听力考前预测试题(3)

zongxujian 于2008-03-19发布 l 已有人浏览
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  专四考前预测——

  专四考前预测——听写(3):vitamins

  it was not until the beginning of this century that it was recognized /that certain substances were essential in the diet to prevent or cure some diseases. / these substances are now known as vitamins. / they are vital for growth, good health,/ and maintenance of the normal functions of the body. / a well-balanced diet should provide all the vitamins we normally require. / those of us who are fortunate enough to be able to buy sufficient food/ should not suffer from vitamin deficiency. / however, for various reasons,/ some people do not maintain a balanced diet. / people often lose their appetite because of illness. / people living alone may not bother to eat proper meals,/ and people on a diet may not eat sufficient quantities of necessary foods. / moreover, modern methods of preserving, freezing and long-time storage of food,/ together with over cooking, can destroy many of the vitamins. /

  we do not know when man first began to use salt, / but we do know that it has been used in many different ways throughout history. /historical evidence shows, for example, that people who lived over 3000 years ago ate salted fish. / thousands of years ago in egypt, salt was used to preserve the dead. /

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