The vaccine(疫苗)was used to _ the whole population _ Bird Flu(禽流感)．

更新时间：2022-08-10 20:08:39

The vaccine(疫苗)was used to _______ the whole population _______ Bird Flu(禽流感)．

A.keep; out of

B.protect; from

C.keep; away

D.make; out of

答案及解析： B

解析：

be used to表示“被用来”，protect…from“保护某人以免受到……的侵害”。