问题补充：
Doing eyes every day is good for our eyes.
A. exercises
B. exercise
C. health
D. healthy
答案：
A. exercises
B. exercise
C. health
D. healthy
解析：该题考查的用法，既是动词（意思为：锻炼），又是名词，当“锻炼”讲时是不可数名词，当“作早操或保健操”讲时是可数名词。故选B。
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