—I can hardly breathe . Our earth is becoming more and more polluted .

—I can hardly breathe . Our earth is becoming more and more polluted .

—So we must stop pollution ______ a green life.

A. living B. from living C. to live D. live

【答案】

C

【解析】

句意：——我几乎无法呼吸。我们的地球正变得越来越污染。——因此，我们必须阻止污染以便活得更长久。考查非谓语动词。A. living现在分词；B. from living阻止活得长；C. to live动词不定式；D. live动词原形。根据句意可知“阻止污染”的“目的”的为了“活得更长久”，所以横线处应使用动词不定式作目的状语，故答案选C。