题目

Americans are proud of their variety and individuality (个性), yet they love and respect few things more than a uniform, whether it is the uniform of a lift operator or the uniform of a five-star general. Why are uniforms so popular in the United States? Among the arguments for uniforms, one of the first is that in the eyes of most people they look more professional than civilian (百姓的) clothes. People have become conditioned to expect higher quality from a man who wears a uniform. The television repairman who wears a uniform is likely to inspire more trust than one who appears in civi　　“水是生命之源”，在国家倡导节能减排的今天，节约用水显得尤为重要。下图是我国“国家节水标志”，看图完成以下问题。（原图阴影部分为绿色） ①请简单说明此标志的构成部分。_______________________________________②探究标志的寓意。_______________________________________