【正文】 s health. good mixed diet normally supplies sufficient vitamins for us. Passage Four What is the importance of the AfroAmerican history to all Americans? How could AfroAmericans contribute anything to American history when they were just slaves and servants? This is the image which many of us are taught when we go to school. 7his is the image many AfroAmericans have of themselves also. The AfroAmericans need to remake their real historical image so that it is known and accepted in its truth fullness by themselves and the rest of the world. Men and women of darker color are human beings entitled to respect and acceptance in history. When we think of famous scientists and inventors we immediately think of men such as Alexander Graham Bell, Thomas Edison and Jonas E. Salk. This is because we associate famous people with the Anglo Saxon race. But what about the AfroAfrican inventors and scientists? How many men during World War I owe their lives to Garrett Morgan who invented the gas mask? Garrett Morgan also invented the traffic light which saves numerous lives on our streets. Daniel Hale Williams was the first successful heart surgeon. Charles Drew saved hundreds of thousands of lives during World War II by his discovery of the ways and means of preserving blood plasma（血漿）. Percy Julian has helped millions suffering from the excruciating（極痛苦的） pain of arthritis. These men and others should be as easily recognized as Bell, Edison and Salk. America is made up of many different blends of cultures. These many cultures have e to enrich and diversify the American way of life. We should not think because history has neglected to include the background of a particular culture, that these people have an inferior history. We should search for the truth and set the record straight against the slanders, the stereo typing and false images which have identified these people. We should understand each of the cultures and learn of their specific contribution to America39。. Quite a number of such substances are known and they are given letters to identify them, A, B, C, D, and so on. Different diseases are associated with deficiencies of particular vitamins. Even a slight lack of Vitamin C, for example, the vitamin most plentiful in fresh fruit and vegetables, is thought to increase significantly our susceptibility to colds and influenza,The vitamins are necessary for a healthy body is normally supplied by a good mixed diet, including a variety of fruit and green vegetables. It is only when people try to live on a very restricted diet, say during extended periods of religious fasting（齋戒）, or when trying to lose weight, that it is necessary to make special provision to supply the missing vitamins. is a disease that is provoked by______. A. salted meat and biscuits B. exhaustion C. want of some essential substances D. lack of fresh vegetables and fruits12. In the last sentence of Paragraph l, warded off could probably be replaced by______. rid of B. killed C. avoided away13. To avoid such disease as scurvy, it 39。 diet and Captain Cook, on his long voyages of discovery to Australia and New Zealand, established the fact that scurvy could be warded off by the provision of fresh fruit for the sailors. Nowadays it is understood that a diet which contains nothing harmful may yet result in serious disease if certain important elements are missing. These elements are called vitamins39。t understand why so many people are opposed to euthanasia A. terrifies B. curses C. puzzles D. injuresPart Two: Reading Comprehension 40%Directions: You will read four passages in this section and each will be followed by five questions or unfinished statements for each of them there are four choices marked ABC and D .You should decide on the best answer. Passage OnePrices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed(配給) among buyers. The price system of the united States is a very plex network posed of the prices of all the products bought and sold in the economy as well as those of a variety of services, including labor, professional transportation, and publicutility services, The interrelationships of all these prices make up the system of prices. The price of any particular product or service is linked to a broad, plicated system of prices in which everything seems to depend more or less upon everything else. If one were to ask a group of randomly selected individuals to define “price”, many would reply that price is the amount of money paid by the buyer to the seller for a product or service or, in other words , that price is the money value of a product or service as a greed upon in a market transaction. This definition is, of course, valid as far as it goes. For a plete understanding of a price in any particular transaction, much more than the amount of money involved must be known. Both the buyer and the seller should be familiar with not only the money amount, but also the amount and the quality of the product or service to be exchanged, the time and the place at which the exchange will take place and payment will be made, the form of money to be sued, the credit terms and discounts that supply the transaction, guarantees on the product or price, delivery terms, return privileges, and other factors. In other words, both buyer and seller should be fully aware of all the factors that prise the total package being exchanged for the askedfor amount of money in order that they may evaluate a given price.1. According to the passage, the price system is related primarily to______. A. products and services B. utilities and repairs C .labor and education D. transportation and insurance of the following is N