前几年，部分巨能钙被检出含有双氧水，而双氧水有致癌性，可加速人体衰老．因此卫生部已开始加紧调查巨能钙．下列有关说法错误的是（　　）

A．H₂O₂、Na₂O₂都属于过氧化物，都存在共价键

B．双氧水是绿色氧化剂，可作医疗消毒剂

C．H₂O₂既有氧化性，又有还原性，与Cl₂、KMnO₄反应是表现H₂O₂的氧化性

D．H₂O₂做漂白剂是利用其氧化性，漂白原理与HClO类似、SO₂不同

完成句子。（每小题1分，共9分）

小题1:The ________________________(develop) of science has changed our life a lot.

小题2:Listening to a talk is ___________________ (please). We all feel bored.

小题3:Most of the visitors got lost in the ___________________(beautiful) of Tianmu Lake.

小题4:It’s __________________(use) to talk so much if you don’t match your words with actions.

小题5:All of us were excited at those ________________ (perform) performance.

小题6:Thousands of_____________________(tour) come to visit our city every day.

小题7:It’s his _________________(five) day in Guiling.

小题8:You are great. You have worked out the problem _________________.(success)

小题9:It’s over three years since I ________________(come) back form Beijing.