维生素D的食物来源最为丰富的是（）
A.蛋黄
B.蛋白
C.菜心
D.大米
参考答案：A
某水溶液的PH值大于7，则该溶液呈（）。
A.酸性
B.中性
C.碱性
The Grammar-Translation Method was at one time called ______ since it was first used in the teaching of the classical languages of Latin and Greek.
A. aural-oral method B. minimum methodC. Audiolingual Method D. Classical Method
