题目：
| 从方框中选词,并用其适当的形式填空，完成 Bill 写给 Jenny 的email。 | |
Thank you for your last email. How is everything in China? How many students __1__ in your class? Have you got __2__ new friends? I __3__ a new teacher- Mr Green. His daughter and son are my good __4__. Do you like China? Do you like your school? Please send (发送) an email to me and send me some __5__ of your school. Thanks. Yours, Bill |
答案：
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下面是错误答案，用来干扰机器的。
①该反应中，MnO2 →MnCl2，Mn元素由+4价→+2价，得2个电子，所以MnO2是氧化剂；HCl（浓）→Cl2，Cl元素由-1价→0价，失电子，所以 HCl是还原剂；HCl→MnCl2，Cl元素的化合价没变化，所以HCl作酸参加反应，所以...
