“亲子鉴定”常从血液中提取DNA，DNA主要来自于血液中的（　　）

读图，人类认识地球形状的先后过程是

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    In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear ____ spoken. Secondly, we must be able to speak it ourselves correctly with ____ (confident) and without hesitation. Thirdly, we must be able to read the language, and fourthly, we must be able to write it. We must be able to make sentences that are ____ (grammatical) correct.

    There is no easy way to success ____ language learning. ____ good memory is a great help, but it is not enough only ____(memorize) rules from a grammar book. It is not much use learning by heart long lists of words and ____ meanings, studying the dictionary and so on. We must learn by using the language. ____ we are satisfied with only a few rules we have memorized, we are not really learning the language. “Learn through use” is a good piece of advice for those ____ are studying a new language. Practice is important. We must practise speaking and ____(write) the language whenever we can.

某兴趣小组拟利用如下图装置探究验证干燥的Cl₂和潮湿的Cl₂有无漂白性．

回答下列问题：

（1）A装置中的主要玻璃仪器有：导管、酒精灯、圆底烧瓶、____ ．

A装置中发生反应的化学方程式是____ ．

（2）按气体从左向右流向将各装置依次连接起来（填接口标号）：a  接____ ，____ 接____ ，____ 　接____ ，____ 接____ ，____ 接____ ．

（3）A装置中发生反应，产生Cl₂后，从集气瓶B、C中有色布条的现象可得出的结论是____ ；其中发生反应的化学方程式为　____ ．

（4）F装置中饱和NaCl溶液作用为____ ．D装置中浓 H₂SO₄作用为____ ．

（5）烧杯E中发生反应的化学方程式为____ 　．

（6）工业生产漂白粉的化学方程式____ 

在反应中消耗2mol氯气，则转移了____ mol电子．

（7）工业上可用氨与Cl₂反应检验输送氯气的管道是否漏气，反应方程式如下：8NH₃+3Cl₂═6NH₄Cl+N₂．该反应中，____ 是还原剂；若反应中有1.5mol氧化剂参与反应，则发生转移的电子的物质的量为____ mol，被氧化的物质有____ mol．