苯胺色素是指以( )为原料制成的食用合成色素。
A．植物种子
B．动物脂肪
C．煤焦油
D．乙醇
参考答案：C
In my opinion, it's the flying birds rather than the pilot that________for the air crash.
A．are to blame
B．is to blame
C．is to be blamed
D．are to be blamed
液体和固体药物均可制备气雾剂。
