Question

Read the passage and fill in the blanks with proper words.

Have you ever noticed the black and white bars on a book? Do you know what they are used for?

They are barcodes(条形码) used in most products. If you go to a supermarket, you can see almost every product with a barcode on it. Barcodes contain i1.about the product, such as name and production date. It’s an easy and convenient way to know about the products. Just scan(扫描) the bars with a barcode reader and everything is c2..

The first use of a barcode in a supermarket checkout system was on a pack of American Wrigley Company chewing gum(口香糖) in 1974. Beyond supermarkets, barcodes are needed e3.: for renting cars, for luggage checks on a plane, for parcels you send; life would be rather difficult without barcodes. Most of our things would get lost in the post.

Barcodes c4. as well. Barcodes in the past were 1-D, but now there are 2-D barcodes, such as QR code. Since 2009, QR has been used on Chinese train tickets. People can e5. stadiums, cinemas and theaters by holding certain types of barcodes.

If you find these barcode things b6., a barcode building might be more up your street. In St Petersburg, Russia, there is a building designed like a barcode. It looks strange, but it’s a7. a shopping mall. There are games too. Barcode Monsters is a mobile phone game. You have to scan barcodes and find the monsters!

Answer 1