显示生词 Tip: 色块区域是你划选过的生词,查询次数越多,颜色越深哦～ 显示重点词 Tip: 加粗单词为本章重点词哦！
A. As encouragement for a more complete answer
B. Because he doesn’t understand the student’s answer
C. To give another student an opportunity to speak
D. For positive reinforcement of a correct answer
even air amount stage cost mineral mention ecosystem environmental deposit pressure vegetation advantage basic economic locate waste landscape addition track construction fuel transport mine additional valuable transportation appearance manufacture raw explore alternative essential destruction mining accumulation substitute manufacturer refine refined exploration exploitation ironic ration personnel
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