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对乙酰氨基水杨酸盐与利福平伍用，使后者作用减弱是由于（）
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Passage Four The blues was born on the Mississippi River Delta in the early 1900s. After the Civil War, the slaves were free but life was still not easy. They had to find new work. In the South, work camps were formed. Black people from these camps worked on farms and on building up the Mississippi River banks. During the week the people worked long and hard. They often lived alone, without their families, far from home. On the weekends, the workers got together at picnics or drinking places. Traveling black musicians with guitars entertained them. The musicians sang songs about the difficult life of the Workers. These songs were called the blues. If you have the blues it means you feel very sad. But blues songs were not always sad. Some of them were happy and many of them were funny. Early blues singers often had very interesting names like Blind Lemon Jefferson, Howlin Wolf. Sometimes the blues singers had song contests. Each singer sang new words or a new style of the blues song. They made up the music as they played. In this way they created new music. This is called improvisation (即兴演奏). Later, improvization became a very important part of jazz music. Blues began in the country in the South. As blacks moved into the big cities to work, the blues went with them. There, they sang about life in the cities. W.C. Handy, a black band leader from Memphis made the blues popular all over America. In 1914 he wrote the most famous blues song of all, "The St. Louis Blues." In the early 1900s, black people often got together at some drinking places on weekends mainly because ______.
关系模式分解的等价性标准主要有两个，它们是分解具有无损连接性和分解 【18】 。
In 1959 the (41) American family paid $ 989 (42) a year’ s supply of food. In 1972 the family paid $1 311. That was a price (43) of nearly one-third. Every family has (44) this sort of experience. Everyone agrees that the cost of (45) a family has risen sharply. But there is less agreement (46) reasons for the rise are being discussed. Who is really (47) Many blame the farmers who (48) the vegetables, fruit, meat, eggs and cheese (49) stores offer for (50) . According to the U.S. Department of (51) , the farmer’s share of the $ 1 311 spent by the family in 1972 was $ 521. This was thirty-one percent (52) than the farmer had received in 1959. But farmers claim that this increase was very small (53) to the increase in their cost of (54) . Farmers tend to blame others for the sharp (55) in food prices. They particularly blame those who (56) the farm products after the products leave the farm. These (57) truck drives, meat packers, manufacturers of packages and other food containers, and the (58) of stores where food is sold. They are among the "middlemen" who stand (59) the farmer and the people who buy and eat the food. (60) middlemen the ones to blame for food price
与牙弓咬合平面大致平行，维持牙齿直立，对抗侧方力
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