48．Where can you probably find the text? 　　(A)In a popular magazine. (B)In a tourist guidebook. 　　(C)In a physics textbook. (D)In an official report.

51．What should we do before attempting to “read” people? 　　(A)Learn about their relations with others. 　　(B)Understand their cultural backgrounds. 　　(C)Find out about their past experience. 　　(D)Figure out what they will do next.