2. A lot of people rely on fish as part of their regular diet. About 3 billion of the Earth's inhabitants get a fifth or more of their _______ from fish—which means that fish are a bigger source of the stuff than beef is.
(A) preservation
(B) probation
(C) protection
(D) protein
答案:登入後查看
統計: 尚無統計資料
統計: 尚無統計資料