中风病的典型症状是下列何项（）
A.舌强语蹇
B.半身不遂
C.肢体麻木
D.肢节疼痛
E.昏不识人
参考答案：B
选择填空。
How many children _____ your uncle ______? [ ]
A. does; has
B. do; have
C. does; have
若函数f（x）=|4x-x2|-a恰有3个零点，则a=______．
