Which of the following opinions about sách hướng dẫnis not mentioned inthe passage?

* Hướng dẫn giải

B. How-to books are useful in many ways ("How-to books are useful....tell you how to earn money....give advice on careers....helps you with personal problems...")

C. How-to books give advice on careers. ("Many How-to books give advice on careers")

D. How-to-books help people with personal problems. ("One of the most popular types of books is one that helps you with personal problems")

=>How-to books are among the best sellers in the world.

Tạm dịch: Sách hướng dẫn là một trong những loại sách bán chạy nhất trên thế giới. 

Đáp án cần chọn là: A