Question

Never form the habit of smoking because it ________ human beings．

[　　]

A．

is harmful with

B．

does harm to

C．

is harm for

D．

does harmful to

Answer 1

答案：B
解析：

harm是名詞或動(dòng)詞，do harm to對(duì)……有害；harmful是形容詞；be harmful to對(duì)……有害。