Some 25,000 people were reported ______ in the ever recorded worst earthquake in Iran, which occurred late this month.

A．were killed

B．to be killed

C．killing

D．to have been killed

(5分)禽流感病毒是一种没有超常抵抗力的病毒。漂白粉是常用的消毒剂，可以将禽流感病毒杀灭。

(1) 漂白粉的有效成分是       （填化学式）。

(2) 工业上制取漂白粉,化学反应方程式为                                       。

(3) 漂白粉溶于水后，受空气中的CO₂作用，即产生有漂白、杀菌作用的次氯酸，化学反应方程式为                                          。