___is very important ___the envioronment around us A this to protect B it to protect

Pay a_______ to this word.It's very important.~

attention
句意是：注意这个单词，它很重要！
用法有后跟名词 pay attention to sth 或者跟动名次 pay attention to doing sth.

to me 是表语补语 即be动词的补语，
绝对不是形式主语的类型，this 指代一个事物，不等于to me
因为形式主语可以替换，如果你把to me
放在前面，to me is important 是不对的
形式主语的一般形式是it is...................to do
for the health 你可以这么理解be good for 是一个phrase “对。。。有好处”
严格来说还是属于补语的范畴，即把句子补充完整
respond 是不及物动词，后面不能直接加宾语，所以要用to
respond to sb也是phrase啦

答案：B
解释：it在句中作形式主语，动词不定式作真正的主语。

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B it to protect

B it to protect

固定结构 It is +形容词 +to do sth ， 所以选B

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