12.D解析:本题考查物质制备流程分析。 Na2 Sno3和Na2TeO3均为盐,且阳离子为Δ项正确;在生产过程中,为増大锡碲渣的碱浸速率和浸岀率,可将锡碲渣粉碎,B项正确;碱浸后加入H2O2氧化,发生反应2Na++TeO+H2O2=Na2TeO↓十H2O,因过滤后得到碲酸钠渣,故 Na teo4不能拆,C项正确;温度过低反应进行较慢,温度过高,过氧化氢会受热分解,因此氧化时温度应控制在60~70℃,D项错误。

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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