Question

【题目】 most of the earth’s surface is covered with water, fresh water is very rare and precious.

A. Since B. While

C. Because D. Although

Answer 1

【答案】D

【解析】句意：虽然地球表面大部分被水覆盖，但是淡水还是非常稀少、珍贵。A. Since由于；B. While当…时候；C. Because因为；D. Although虽然、尽管。根据句意可知本题考查让步状语从句，故答案选D。