我们每天摄入的营养成份中， 是构成细胞的基本物质， 是细胞的主要组成成份。
蛋白质；水
The teacher said that we ______ ten lessons by the end of this term. [ ]
A. should study
B. have studied
C. were going to study
D. should have studied
下列我国古代演奏乐器中，被列入世界非物质文化遗产的是（）。
A.二胡
B.琵琶
C.古琴
D.笙
