螺甾烷醇和异螺甾烷醇二者互为异构体，常常是共存于植物体，且螺甾烷醇比异螺甾烷醇要稳定，因此异螺甾烷醇型易转化为螺甾烷醇型。
参考答案：错
We had great fun _____ in the park. [ ]
A. play
B. plays
C. playing
D. Played
标本兼顾适用于（）
A.邪退正虚
B.虚人感冒
C.邪盛、正虚但尚耐攻
D.邪气亢盛，正气受伤
E.邪气亢盛，正气未伤
