原式=3.
故答案为:3
He has made up his mind to devote his life _________ pollution _________ happily.
A.to prevent; to live
B.to prevent; from living
C.to preventing; to live
D.to preventing; from living
青春期女性调经重在()
A.治肾
B.治肝
C.养血
D.治脾
E.益气