The ozone layer plays as great a role in the stability of spaceship Earth as ______ the waters of its lakes, ponds, oceans, rive

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问题 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.

选项 A、do
B、does
C、play
D、are

答案A

解析助动词+主语构成的倒装结构，强调主语，省去主要动词，又waters为复数。所以选A。

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