Drinking water                      excessive amounts of fluorides may leave a stained or mottled effect on the enamel of teeth.

Câu hỏi :

 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

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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