Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
The human ear cannot hear a sound that vibrates less than 16 times the second.
A. ear
B. a sound that
C. less than
D. the second
The human ear cannot hear a sound that vibrates less than 16 times the second.
A. ear
B. a sound that
C. less than
D. the second
Phương án D được sữa lại là per second (16 lần trên 1 giây)
Đáp án D.