Ken with me on the phone at 8:00 pm yesterday evening.

A. is talking B. was talking C. has talked D. is talked

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We see them everywhere — on boxes of food, on packages and on CDs. They, of course, are bar codes. The invention of bar codes has changed the way we shop and how companies learn where their products are.

It was two university students from America, Bernard Silver and Norman Woodland, who first got theidea of bar codes. In 1948, they heard that the president of a food company was looking for a way to easily get information about what was being sold to customers. They tried to help by using a code system. They invented a large electronic reader to read the codes. However, computers couldn’t easily record the data that was read.

Then, in the 1960s, David Collins made important developments in bar codes. He developed a system for recognizing train carriages. In order to develop the recognition system for other kinds of businesses, Collins started his own company. In 1969, Collins’s company put a bar code reading system in a car factory, showing that bar codes could be useful.

Shortly after Collins started his company, an American electronic company called RCA also saw the potential (潛力) of bar codes to help businesses. RCA’s

system, which recorded how much of a product was sold, was not perfect. Since bar codes were not common, not all products had them and different companies used different codes. Then, Woodland helped develop the Universal Product Code (UPC), which gave every product a code that included information about the manufacturer and the kind of product being sold. This made bar codes much more practical.

In addition to shops, hospitals use bar codes to recognize patients by giving them cards with bar codes on them. Libraries use bar codes to record which books have been lent, and airports use them to find out where bags are going. Bar codes have made life much easier and simpler.

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2.Who first got the idea of bar codes?

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4.What do hospitals use bar codes to do?

5.What is the passage mainly about?

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You will not want to miss this celebration for the opening of your new neighborhood bookstore! It is at 2289 Main Street. Come on Saturday!

Wide Selection（選擇）

The Book Nook has four floors with books of all kinds. If we do not have the book you are looking for, we can specially order it for you. You will have it in your hands in two days!

Reading Nooks

We are proud of our children’s reading area (located behind the Poetry Section on the first floor), as well as our teenagers’ area on the third floor. Settle in one of these inviting reading areas with a good book and a free cup of hot chocolate. You will discover the perfect way to spend a few hours.

Book Events

The Book Nook will have monthly book signings by different writers, giving you a chance to meet and speak with well-known writers.

We also have summer reading programs for children of all ages. These programs are a great way to meet other children and share ideas about your favorite books.

So please join us on Saturday and learn about all that The Book Nook has to offer. You can come anytime between 10 A.M. and 10 P.M. — the celebration lasts all day long!

1.The teenagers’ reading area is on the _______ floor.

A. first B. second C. third D. fourth

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A. meet famous writers B. listen to live music

C. get food for free D. order books at home

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