CHOOSE THE CORRECT ANSWER

6. - CAU HOI CHO TIET CHUYEN DE CAP QUAN, HUYEN 2
CAU HOI CHO TIET CHUYEN DE CAP QUAN, HUYEN 2
6.Choose the correct answer:Silver is the commonest precious metal. What is half the silver mined used for?A, filling teethB, Coating photographic film.C, making coins.( key: b )