Read the following passage on transp...

Câu hỏi: Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 38 to 42

A. they are indispensable in everyday communications 

B. they make them look more stylish 

C. they keep the users alert all the time 

D. they cannot be replaced by regular phones