—How old are you?
—I'm twelve years _____. [ ]
A. class
B. grade
C. old
答案：C
举杯邀明月，对影成三人”，这里的三“人”其中的一“人”是出于光的直线传播形成的 ．
-Would you like some water with ice?
-________. [ ]
A. Yes，please
B. Yes, I do
C. Yes, I would
D. Yes, I am
