Question

【题目】To make rivers than before, everybody is supposed to protect them.

A. dirtyB. dirtierC. cleanD. cleaner

Answer 1

【答案】D

【解析】

句意：为了使河流比以前更清洁，每个人都应该保护它们。A. dirty脏的；B. dirtier更脏的；C. clean干净的；D. cleaner更干净的。根据than判断，这是一个比较级的句子，排除A,C；根据“everybody is supposed to protect them.”可知，保护河流的目的是让它们更清洁干净，故答案为D。