____ at half past eight. [ ]
A. Class begin
B. Classes begins
C. Class begins
答案:C
正常机体的蛋白质(氨基酸)需要量为( ),应激、创伤(包括大手术)时蛋白质需要量则可增加到( )。
_____ apples do we need to make apple pies?[ ]
A. What
B. How
C. How many
D. How much