中考阅读还原5选4专项练习（二）.

中考阅读还原5选4专项练习（二） 一 根据短文内容，从下列选项中选出能填入文中空白处的最佳选项。选项中有一项为多余选项。 The invention of barcodes（条形码）is based on a very simple idea. We only need to give each product a specific number and print it. 1 We could simply print the number itself. But this can cause problems. For example, an unclearly printed “seven” could look like a “one” to a computer. It’s also true for “three” and “eight”. 2 We need a better way of printing numbers so that they can be read correctly at high speeds. That’s the problem barcodes solve. Each number in a barcode is shown by seven blocks of the same size. These are colored either black or white to show the number zero to nine. For example, the number “one” is shown in turn by two white stripes（条）, two black stripes, two white stripes, and one black stripe. 3 A barcode includes different parts and each one provides a specific meaning. The first part of a barcode tells you the country where the product was made. For example, 690—692 is the barcode for China. 4 The final part is about the product itself. This is how barcodes work. A．Then computers can read it directly. B．All information can be shown by barcodes. C．The next part tells you who produced the product. D．And “nine” looks similar to “six” if you turn it upside down. E．Even if you turn it upside down, it isn’t similar to any other number. 二 To be a volunteer means to do something that is not required, to offer help without expecting payment, and to work with others towards a goal that benefits someone else. So volunteers help those in need and make a difference to their lives. But do you know that volunteering can also benefit your own health? Volunteering helps you earn others’ respect. You are immediately seen as selfless and helpful when you help others. 1 . For example, when you get involved in a cleanliness activity at the school level or other community proje