Today is his ____________ birthday.[ ]
A. grandmother
B. grandmothers
C. grandmother's
答案:C
I smoke out of ______ habit, not for ______ pleasure; for I have been in the habit for more than twenty years.
A.the; a
B.不填; the
C.a: the
D.不填; 不填
外伤出血时,血液喷射而出,说明可能伤及[ ]
A.表皮
B.动脉血管
C.静脉血管
D.毛细血管