【题目】It is important to keep industrial waste from entering the rivers and lakes. If we do not do so, efforts to protect the environment will ____________.
A.Go down the drainB.suck it and see
C.make the headlinesD.smooth the way
在线课程【答案】A
【解析】
考查习语。句意：防止工业废物进入河流和湖泊是很重要的。如果我们不这样做，保护环境的努力就会付诸东流。A. go down the drain枉费心机；B. suck it and see试试看；C. make the headlines成为头条新闻；D. smooth the way为……铺平道路。根据“If we do not do so,”可知，如果我们不防止工业废物进入河流和湖泊，保护环境所做的努力就会白费了。故选A。