Cho ba dung dịch có cùng nồng độ mol: (1) H₂NCH₂COOH, (2) CH₃COOH, (3)CH₃CH₂NH₂. Dãy xếp theo thứ tự pH tăng dần là:

A. (2), (1), (3).

B. (2), (3), (1).

C. (3), (1), (2).

D. (1), (2), (3).

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

A. resource

B. sensible   

C. treatment          

D. vapour