ACCORDING TO THE AUTHOR, THE IMPRACTICABILITY OF USING COAL, OIL S...

54. - Đề thi học sinh giỏi cấp trường môn Tiếng Anh
Tiếng Anh Đề thi học sinh giỏi cấp trường môn Tiếng Anh
54. According to the author, the impracticability of using coal, oil shale and coal tars as sources of energy is due to ___________ .A. their being time consuming B. their being money consumingC. the scarcity of sources D. the lack of technology their being money consuming.