不同时期流行着不同的话语。请将下列词汇反映的历史事件按照先后顺序排列（    ）

①多快好省②“改革开放”③“打倒一切”④“两个凡是”

配平下列化学方程式：

（1）　____ 　Al₂O₃____ 　Al+____ 　O₂↑

（2）　____ C₂H₄+____ 　O₂____ CO₂+____ 　H₂O

（3）____ 　KClO₃$\stackrel{△}{=}$____ KCl+____ O₂↑

（4）　____ Fe₂O₃+____ CO____ 　Fe+____ 　CO₂．

阅读短文并判断正误。

    Billy is my cat. She is very beautiful. Billy likes jumping. She hurts her leg when she jumps. "Ouch !Get help!" I call the ambulance and take her to the hospital. But, the doctors can't help her. We go to the police office to ask for help. The policeman calls a vet. She comes quickly and help to Billy. Now, Billy is all right. Look! She is jumping on the chair!