Question 24: Drinking water                 excessive amounts of fluorides may leave a stained or mottled

effect on the enamel of teeth.

A. containing                     B. including                       C. made up of                         D. composed of

1000 câu khó mục tiều 9+ Tiếng anh ôn Tốt nghiệp THPT Quốc Gia (Lesson 8)