Did you notice the number on the book in a library? That number is part of the system used

Did you notice the number on the book in a library? That number is part of the system used by libraries to organize their collections of books. And it’s used in many countries. The number on each book tells you exactly what kind of book it is. This system is also useful for knowing where to go in the library to find a book.
In this system, there are ten large groups of books. Each of these groups has its own number, such as 100, 200, etc. So, for example, any books about language will have a number 400. On the other hand, any books about history will have a number 900. So, a number in the hundreds place tells you what general group a book is in. If you find a book that has a number in the 500s, you know it is a book about science.
However, science is a big group, so the tens place is used to make a more detailed set of science books. For example, math books are included in the group of science books. Math books all have numbers between 510 and 519. Books about the history of Africa have numbers between 960 and 969.
The system uses the ones place to give a more exact limit for the subject of a book. A book on the history of South Africa will have the number 968.
As you can see, it is a simple system to use as long as you understand what the numbers mean. With this system, the library can keep its books well organized, and people can easily find the book that they want.
【小题1】The reading is about .A．librariesB．working in a libraryC．how numbers are organizedD．how books are organized in libraries【小题2】The number system is NOT used to . A．find where a book isB．tell you the title of a bookC．tell you what kind of book a book isD．organize the collections of books in libraries【小题3】According to the reading, which sentence is TRUE?A．The number on a book can’t be bigger than 900.B．There are ten big groups for books in this system.C．History books can have any number between 500 and 900.D．This system uses both numbers and letters for some books.【小题4】A book about math can be found in the same group of books as .A．reference booksB．school booksC．science booksD．art books【小题5】Which two numbers would indicate a book about language and a book about science?A．439 and 493B．439 and 568 C．530 and 560D．563 and 436D

(答案→)D 解析：【小题1】理解归纳题，纵观全文理解可知。【小题2】细节理解题，根据文中第一自然短的语句理解可知。【小题3】细节理解题，根据文中语句“In this system, there are ten large groups of books.”理解可知。【小题4】细节理解题，根据文中语句“For example, math books are included in the group of science books.”理解可知。【小题5】细节理解题，根据文中语句理解可知。

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