题目

为做好新冠疫情的防控工作，某单位需购买甲、乙两种消毒液经了解每桶甲种消毒液的零售价比乙种消毒液的零售价多 6元，该单位以零售价分别用 900 元和 720 元采购了相同桶数的甲、乙两种消毒液． （ 1）求甲、乙两种消毒液的零售价分别是每桶多少元？ （ 2）由于疫情防控进入常态化，该单位需再次购买两种消毒液共 300 桶，且甲种消毒液的桶数不少于乙种消毒液桶数的 ，由于购买量大，甲、乙两种消毒液分别获得了 20元 / 桶， 15 元 / 桶的批阅读理解 　　“High tech” and “state of the art” are two expressions that describe very modern technology.High tech is just a shorter way of saying high technology. And high technology describes any invention, system or device that uses the newest ideas or discoveries of science and engineering. 　　What is high tech? A computer is high tech. So is a communications satellite. A modern manufacturing（制造业的） system is surely high tech. 　　High tech became a popular expression in the United States during the early 1980s. Because of improvements in technology, people could buy many new kinds of products in American stores, such as home computers, microwave ovens （微波炉） , etc. . 　　“State of the art” is something that is as modern as possible. It is a product that is based on the very latest methods and technology. Something that is “state of the art” is the newest possible design or product of a business or industry. A state of the art television set , for example , uses the most modem electronic design and parts. It is the best that one can buy. 　　“State of the art” is not a new expression. Engineers have used it for years, to describe the best and most modern way of doing something. 　　Millions of Americans began to use the expression in the late 1970s. The reason was the computer revolution. Every computer company claimed （声称） that its computers were “state of the art”. 　　Computer technology changes so fast that a state of the art computer today might be old tomorrow. The expression “state of the art” has become as common and popular as computers themselves. Now all kinds of products are said to be “state of the art” . 1．What is the purpose of the passage? [　　] A．To tell how “high tech” and “state of the art” have developed. B．To give examples of high tech. C．To tell what “high tech” and “state of the art” are. D．To describe very modern technology. 2．What can we infer （推断） from the passage? [　　] A．American stores could provide new kinds of products of the people. B．High tech describes a technology that is not traditional. C．“State of the art” is not as popular as “high tech”. D．A wooden plough pulled by oxen is “state of the art”. 3．Which of the following statements is NOT true? [　　] A．Since the computer revolution, the expression “state of the art” has become popular. B．“State of the art” means something that is the best one can buy. C．With the rapid development of computer technology, a state of the art computer may easily become out of date. D．All kinds of products are “state of the art” nowadays. 4．The best title for the passage is ________. [　　] A．Computer Technology B．High Tech and State of the Art C．Most Advanced Technology D．Two New Expressions