肾虚头痛的特征是（）
A.头痛如裹
B.头痛如裂
C.头痛且空
D.头痛且晕
E.头痛昏蒙
参考答案：C
最小的整数是[ ]
A．1
B．0
C．﹣1
D．不存在
I didn't notice you _____ a box when you came in. [ ]
A. is carrying
B. carrying
C. to carry
