分离α-细辛醚和β-细辛醚用

A．AgNO₃硅胶柱色谱
B．60%～65%H₃PO₄
C．吉拉尔试剂
D．氧化铝柱色谱
E．硅胶柱色谱

The girl had to ____the college entrance exam because of her maother’illness.

A．leave

B．abandon

C．desert

D．pause