中医急诊病机变化中最关键的病机是
A．阴阳失衡B．寒热转化C．脏腑传变D．正邪交争E．表里传变
参考答案：D
胁痛虚证取足厥阴、足少阳经穴为主。
They are going ______ a picnic next Sunday. [ ]
A. to
B. at
C. for
D. on
