马蹄足可见于()
A.小腿三头肌麻痹
B.腓总神经麻痹
C.跟腱挛缩
D.胫前胫后肌麻痹
E.小儿麻痹后遗症
参考答案:B, C
已知(x2+y2+1)(x2+y2+3)=8,则x2+y2的值为 ( )
A.-5或1
B.1
C.-5
D.5或-1
The other day, I found my banknote ________ I had left some weeks before. [ ]
A. that
B. which
C. where
D. /