阅读理解
Beep! Beep! Beep! The barcode (条形码) technology (科技) makes it faster and easier to buy things in stores. This year, the great invention is 51 years old!
On a Sunday afternoon in 1971, an IBM engineer named George Laurer came up with a code (代码) that could be printed on food packages (包装). Based on this code, a complete code system came into being later. The system was used by many companies from 1973. Before this, shopkeepers had to write down prices by hand, which took much time and energy.
Actually, a barcode is really a simple idea: show each product's information in different numbers (just like the ID card number for the product), then include these numbers into a code and print it for computers to read. It has turned out to be a really great invention.
What information does a barcode carry? Where the product comes from, its price, production date… you name it. It can also help stores always know about their products. For example, if there are 10 boxes of milk and a customer buys one, it will be recorded so that the store owner knows there are nine boxes left on the shelf. In the 1980s, libraries started using barcodes to follow their books in this way.
Inspired (启发) by it, the more developed codes have been invented later, such as QR codes. QR codes can hold more information. They can tell customers what materials are used in a product or if the product is suitable for certain people. This keeps providing the customers with greater trust in the products they will buy.
(1)
What can we learn from Paragraph 2?
A . The code system was made in the morning.
B . Many companies began to use barcodes in 1971.
C . The IBM engineer named George Laurer is 51 years old now.
D . It was hard to record products' prices before barcodes were invented.
(2)
What can we learn from the passage?
A . Libraries use QR codes to follow their books.
B . QR codes have a history of more than 50 years.
C . People use QR codes more often than barcodes now.
D . The barcode can be used to record the number of products.
(3)
Why does the writer write the passage?
A . To show some changes of stores.
B . To call on people to use barcodes.
C . To introduce a great invention to people.
D . To introduce a great engineer to people.
答案: D
D
C