【zhu】評論
__4__ there’s no known cure for measles, it can be prevented by injecting children with a vaccine. 雖然麻疹目前沒有可有效治癒的療法,但可為兒童注射疫苗來加以預防。(A) While 雖然(B) As 如(C) Once 一旦(D) If 如果