Constant correction by a teacher is often counterproductive, as the student may become afraid to speak at all.
Giải chi tiết:
Đáp án là D. counterproductive : không hiệu quả >< effective: hiệu quả
Nghĩa các từ còn lại: desolate: bị tàn phá; unproductive: không phát sinh; barren: cằn cỗi
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.
Population growth rates vary among regions and even among countries within the same region.