题目

下图是在实验室里制取气体时的常用装置。 （1） 仪器①名称是。 （2） 实验审用A装置制取CO2时加入的液体药品液面高度应该在（填“a”或“b”）处。 （3） 用加热KMnO4的方法制取O2 ， 可以选用的发生装置是（填序号），反应的化学方程式为。 答案：【1】试管 【1】b 【1】C【2】2KMnO4Δ__K2MnO4+MnO2+O2↑ In 1939 two brothers, Mac and Dick McDonald, started a drive-in restaurant in San Bernadino, California. They carefully chose a busy corner for their location. They had run their own businesses for years, first a theater, then a barbecue(烤肉) restaurant, then another drive-in. But in their new operation, they offered a new, shortened menu: French fries, hamburgers, and sodas. To this small selection they added one new idea: quick service, no waiters or waitresses, and no tips.Their hamburgers sold for fifteen cents. Cheese was another four cents. Their French fries and hamburgers had a remarkable uniformity(一致性), for the brothers had developed a strict routine(程序) for the preparation of their food, and they insisted on their cooks’ sticking to their routine. Their new drive-in became surprisingly popular, particularly for lunch. People drove up by the hundreds during the busy noontime. The self-service restaurant was so popular that the brothers had allowed ten copies of their restaurant to be opened. They were satisfied with this modest success until they met Ray Kroc.Kroc was a salesman who met the McDonald brothers in 1954, when he was selling milkshake-mixing machines. He quickly saw the special attraction of the brothers’ fast-food restaurants and bought the right to franchise(特许经营) other copies of their restaurants. The agreement struck included the right to duplicate(复制) the menu, the equipment, even their red and white buildings with the golden arches(拱门).Today McDonald’s is really a household name. In 1976, McDonald’s had over $1 billion in total sales. Its first twenty-two years in one of the most surprising success stories in modern American business history.【1】This passage mainly talks about ________.A.the development of fast food servicesB.how McDonald’s became a billion-dollar businessC.the business careers of Mac and Dick McDonaldD.Ray Kroc’s business talent【2】Mac and Dick managed all of the following businesses except ________.A.a drive-inB.a theaterC.a cinemaD.a barbecue restaurant【3】We may infer(推断) from this passage that ________.A.Mac and Dick McDonald never became wealthy for they sold their idea to KrocB.the place the McDonalds chose was the only source of the great popularity of their drive-inC.forty years ago there were lots of fast-food restaurantsD.Ray Kroc was a good businessman【4】The passage suggests that ________.A.creativity is an important element of business successB.Ray Kroc was the close partner of the McDonald brothersC.Mac and Dick McDonald became broken after they sold their ideas to Ray KrocD.California is the best place to go into business