The boy burst into tears ________ he saw his mother.

A．at the moment

B．in a moment

C．for a moment

D．the moment

下列哪味属于《神农本草经》记载反乌头的药物

A．全瓜萎

B．瓜蒌皮

C．瓜蒌仁

D．瓜蒌霜

E．瓜蒌根