THE WORD “IT” IN THE LAST LINE OF THE FIRST PARAGRAPH REFERS TO ……...

DAP AN DE LUYEN THI DH TIENG ANH DAP AN DE LUYEN THI DH MON TIENG ANH NGAY 1142014

68. The word “it” in the last line of the first paragraph refers to ………. . A. light bulb B. energy C. molecule D. atom