单选题 The ozone layer plays as great a role in the stability of spaceship Earth as ______ the waters of its lakes, ponds, oceans, rivers, and streams.

【正确答案】 A
【答案解析】[解析] 本题考查的是助动词+主语构成的倒装结构，强调主语，省去主要动词，waters为复数，因此A项为正确答案。