单选题 Russian women had to wear protective masks as they walked in Moscow, which was ______ by a heavy smog yesterday.
A. shrouded B. unveiled C. decayed D. deprived

【正确答案】 A

【答案解析】[解析] 本题空格处是说覆盖着一层浓雾。shroud的意思是“覆盖，遮蔽”；unveil的意思是“显露，除去面纱”；decay的意思是“腐烂”；deprive的意思是“剥夺，使丧失”。只有A项符合题意。