(6分)除了铝盐之外,铁盐和亚铁盐也可用作净水剂。若向自来水中加入亚铁盐,亚铁离

题型:判断题

问题:

(6分)除了铝盐之外,铁盐和亚铁盐也可用作净水剂。若向自来水中加入亚铁盐,亚铁离子首先与自来水中残留的氯气发生反应生成铁离子,铁离子发生水解生成带正电荷的氢氧化铁胶体,氢氧化铁胶体吸附带负电荷的胶粒,从而起到净水作用。写出亚铁盐净水过程中发生反应的离子方程式。

考点:室内空气污染大气污染、改善大气质量水的净化与处理水体污染、爱护水资源
题型:判断题
阅读下列短文,根据所读的内容在文章后的表格中填入恰当的单词。注意表格中的每个空格只填1个单词。
注意:每个空格只填1个单词
Although most of us have been learning English for more than three years or even more, we still doubt whether every one of us has already known how to learn English well.
Some students still think that learning English is just to remember new words, phrases, grammar rules and some sentence structures. It seems if we do so, we can have a good knowledge of English. We must make sure that things are not always what they seem to be.
Now imagine how we learn our mother tongue well. We learn it well by communicating with the people around us all day long. So we think it’s not difficult for us to learn our mother tongue.
Why do we think it is hard to learn English well? We all know that learning English usually takes place in schools and there are few opportunities to communicate with other speakers of the language. As a result, some think that learning English is slow and much difficult. It’s because we spend less time learning and practicing it than doing our mother tongue.
The following may help us in some way.
We should gain confidence and we must be brave enough to speak English before others. Don’t be afraid of losing our faces while talking with others in English.
We must make a long and careful study plan. Once we do it, we must take pains to continue learning English every day.
Think about what we have done and decide to study English harder than ever.
Finally we should take every opportunity to practice speaking English as often as possible.
Title: ___小题1:___ to Learn English Well
The present situation
Although we have learned English for several years, not all of us  小题2:  how to learn English well.
The  小题3: for being hard to learn English well
Just keeping in   小题4: new words, phrases, grammar rules and sentence structures.
Students seldom __小题5:____ with other English speakers in English.
Less time is  小题6: in learning and practicing English.
小题7: on learning English well
Be confident and 小题8:  while speaking English in public..
 小题9: plan your study and stick to it for a long time.
Know your doings and make a decision to study English harder.
Take every  小题10: to practice your spoken English very often.
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