Doing eyes _______ every day is good for our eyes.
A．exercises B．exercise C．healthD．healthy
B. 
該題考查的用法，既是動詞（意思為：鍛煉），又是名詞，當(dāng)“鍛煉”講時是不可數(shù)名詞，當(dāng)“作早操或保健操”講時是可數(shù)名詞。故選B。
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