DISCOVERED (A) OVER 2,000 YEARS AGO,(B) COPPER IS ONE OF THE (...

câu 57. - DE THI KIEM TRA KIEN THUC GIAO VIEN
DE THI KIEM TRA KIEN THUC GIAO VIEN

Câu 57. Discovered (A) over 2,000 years ago,(B) copper is one of the (C) earliest know (D)

metals.