已知f（x）=2x-1，且f（a）=3，则a=______．
∵f（x）=2x-1，且f（a）=3，
∴2a-1=3，解得a=2．
故答案是：2．
There ______ a basketball final next week. [ ]
A. will have
B. is going to have
C. are
D. is going to be
慢性肾小球肾炎致慢性肾功能不全时（）
A．血尿酸高于正常
B．尿尿酸240mg/24h
C．二者均有
D．二者均无
