问题补充：
是No harm is done to your health if...还是no harm does to your health if.如题
答案：
No harm is done to your health if...这句语法上是对的,但是一般不这么写
There is no harm to your health if...这样写更好
no harm does to your health if.这句是错的,应该是
It does no harm to your health if...这样才对
======以下答案可供参考======
供参考答案1:
is done 对
供参考答案2:
No harm is done to your health if...这句语法上是对的，但是一般不这么写
There is no harm to your health if... 这样写更好
no harm does to your health if.....这句是错的，应该是
It does no harm to your health if...这样才对
