–Do you know Henry didn’t win that speech contest？

--_________? I thought for sure he would. He worked so hard on it.

A．Do I

B．Don’t I

C．Did he

D．Didn’t he

四季豆中毒的有毒成分是______。

A．秋水仙碱

B．皂素

C．龙葵素

D．毒蝇碱