某探究小组为测定赤铁矿中Fe₂O₃的质量分数，设计了如下装置，请回答：

（1）指出R仪器的名称是 _________ ．

（2）实验开始有如下操作：X：点燃酒精灯①，Y：点燃酒精灯②，Z：打开分液漏斗活塞，其操作顺序是 _________ （用X、Y、Z填空）．

（3）若缺少D装置，则会产生的后果是 _________ ，若实验只提供了一个酒精灯，则你的处理方法是 _________ ．

（4）我们还可用A装置在实验室制取的一种气体是 _________ ，其反应的化学方程式为 _________ ，该气体可用 _________ 法收集．

（5）该小组称耿此矿石样品10g，充分反应后得到的固体有7.6g，则样品中Fe₂O₃的质量分数为 _________ ．

 根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Policeman：Now， Jimmy， did you get a good view（看清） of the accident？

Jimmy：Oh， yes. I was standing outside the bank building and I saw it quite clearly.

Policeman：Do you know what time it was？

Jimmy：Yes.___1___ It was 2：45 exactly.  

Policeman：Good. ____2____

Jimmy：Well， quite slowly — about 10 miles an hour. It was coming up York Road. ____3____ But they were still red when he went over them.

Policeman：I see. ____4____ was it also driving slowly？

Jimmy：It was coming along Union Street about 30 miles per hour. It was a blue Toyota. ____5____

Policeman：Did you see what colour his traffic（交通） light was？

Jimmy：Yes， it changed to yellow just before he crossed it.

A．What about the car？

B．I checked my watch.

C．Didn‘t you see the car？

D．Now，how fast was the truck moving？E. Was the car going beyond the speed limit？

F. I suppose the truck driver knew the lights were going to change.

G. The driver stopped his car when he saw the truck crossing the street.