骨嗜酸性肉芽肿好发于（）
A.颅骨
B.骨盆
C.肋骨
D.脊柱
E.股骨
参考答案：A, B, C, D, E
— _____ do you surf the Internet, Kate? — Not often, twice a month.
A．How long
B．How old
C．How often
D．How many times
触电分为（）和（）两种形式
