题目

—I really like Ms. Black. I think she's a great teacher. —______. She's the best teacher in our school. A . I don't know B . I don't think so C . That's for sure D . That's OK 答案：C生活中“富硒苹果”“高钙牛奶”中的“硒”和“钙”是指A.元素B.单质C.原子D.分子