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 ． It can 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. 3 ． For example, the number “one” is shown in turn by two white stripes （条） , two black stripes, two white stripes, and one black stripe. 4 ．
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. 5 ． 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.
F.These are colored either black or white to show the number zero to nine.
答案
1 ． A
2 ． D
3 ． F
4 ． E
5 ． C
【分析】
本文主要介绍了条形码的相关知识。
1 ．
根据 “We only need to give each product a specific number and print it.” 可知，上文讲述了如何使用条形码，与其对应的应该是选项 A“ 然后计算机可以直接读取。 ” 介绍接下来的步骤。故选 A 。
2 ．
根据 “For example, an unclearly printed ‘seven’ could look like a ‘one’ to a computer. It’s also true for ‘three’ and ‘eight’. ” 可知，上文介绍仅仅打印数字会存在数字混淆的问题，选项 D“ 如果你把它翻过来， ‘ 九 ’ 看起来和 ‘ 六 ’ 很像。 ” 符合语境。故选 D 。
3 ．
根据 “For example, the number ‘one’ is shown in turn by two white stripes, two black stripes, two white stripes, and one black stripe.” 可知，数字 “1” 可以用白色和黑色的条来表示，选项 F“ 它们被涂成黑色或白色来表示数字 0 到 9 。 ” 符合语境。故选 F 。
4 ．
根据 “That’s the problem barcodes solve.” 以及 “For example, the number “one” is shown in turn by two white stripes...” 可知，条形码用白色和黑色的条解决了数字混淆的问题，选项 E“ 即使你把它颠倒过来，它也和其他数字不一样。 ” 符合语境。故选 E 。
5 ．
根据 “The first part of a barcode tells you the country where the product was made.” 以及 “The final part is about the product itself.” 可知，此处介绍条形码的最后部分，选项 C“ 下一部分告诉你是谁生产的产品。 ” 符合语境。故选 C 。
B
D
