—Do you know ________? —To protect our only home — the earth. A.how we... _满分5

—Do you know ________?

—To protect our only home — the earth.

A.how we should live a green life B.why should we live a green life

C.what we should live a green life for D.whether we should live a green life

答案：

C 【解析】句意：——你知道为什么我们应该过一种绿色的生活？——为了保护我们唯一的家园——地球。考查宾语从句辨析。宾语从句遵循陈述句语序，故排除B；根据下文“To protect our only home — the earth”（为了保护我们唯一的家园——地球）可知，不定式表目的，故空格处是询问“为什么我们应该过一种绿色的生活”，从句意上排除A和D选项；C选项what...for为什么，表目的，故选C。

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