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问题 填空题

某商品按原价的八折出售，售价为14.80元，那么原定价为    ____________元.

答案

18.5

题目分析：设原定价为x元，根据“按原价的八折出售，售价为14.80元”即可列方程求解.

设原定价为x元，由题意得

，解得

所以原定价为元.

点评：解题的关键是读懂题意，找到等量关系，正确列出一元一次方程求解.

单项选择题 A1/A2型题

下列哪一种药物最常应用于治疗冠心病变异型心绞痛发作（）

A.α受体阻滞剂

B.β受体阻滞剂

C.钙通道阻滞剂

D.硝酸酯类

E.血管紧张素转换酶抑制剂
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单项选择题

Like all the huge metropolises of the world, there are lots of diversions both outdoors and indoors in Chicago. The Art Institute of Chicago has one of the world’s (1) art collections, including more French Impressionist paintings than even in the Paris Louvre itself. The Field Museum of Natural History and the Museum of Science and Industry are also great historical and cultural treasure houses to (2) as well as entertain children and adults (3) In the Field Museum one comes (4) a surprisingly big collection of Chinese exhibits from the ancient (5) to the early century. The Sears Tower and the Buckingham Fountain are the pride of the Chicagoans; (6) having 110 storeys is said to be the highest tower in the world and the (7) is the largest fountain in the United States. Lake Michigan is for yachting in summer time, (8) the highlights of Chicago life all the year round are concerts, operas and plays (9) by the city’s orchestra, opera houses and theatres. In summer, especially around the Independence Day, July 4th, many festivals and fairs are given outdoors, which, (10) crowds and crowds of people, with their parades, fireworks, (11) concerts, water-skiing and good foods.

But with all its attractions and beautiful spots Chicago is also a city (12) for crimes. All the dwelling houses are (13) with three doors and visitors have to speak through microphone (14) in the wall to the residents before they can get admitted. In the streets there are white-color telephones. When one finds oneself (15) , he needs only to knock the receiver (16) the hook and the next instant the police will (17) . If one does not drive a car, it may well be dangerous for him or her to go out alone in the evening. At first I did not take this warning seriously. (18) , my two encounters with the Black people (19) dusk in the neighborhood were so unpleasant and frightening that I have (20) shut myself evenings in my room, in almost all studying, imposing a curfew on myself.

4（）

A.upon

B.to

C.with

D.for
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