根据短文判断下列句子是否正确,正确的写 “正确”,错误的写 “错误”

    Hello, my name is Li Ming. I am a boy. I am eleven years old. Now let me tell you something about my family. There are four people in my family. They are my father, my mother, my sister, and I. My father likes January and February. I like October. I don't like January and February. It's cold today.

如果$a+\frac{1}{b}=1$，$b+\frac{1}{c}=1$，那么$c+\frac{2}{a}$等于（　　）

清新的空气，污染指数___，对人体健康___；污浊的空气，污染指数____，对人体健康___．（　　）