在非典的危机中，公共财政发挥了积极作用，构建公共财政的应急反应机制可以在短时期内实现，不必提前准备。
参考答案：错
-They are quiet, aren't they?
- Yes. They are accustomed ________ at meals.[ ]
A．to talk
B．to not talk
C．to talking
D．to not talking
缓聚剂
