男,18岁,头痛5个月,CT示松果体区有一2cm×2cm稍高密度影,边界清楚,中等均匀强化,最大可能是()
A.肿瘤
B.囊肿
C.结核
D.脓肿
E.动静脉畸形
参考答案:A
I didn't pass the math exam last month. _____, how do you study for a math test? [ ]
A. By accident
B. By mistake
C. By the way
D. By the time
什么叫中级客车?