下列是用化学方程式表示的化学变化，请在每小题后的横线上注明能量的转化形式。

(1)Zn +Ag₂O + H₂OZn(OH)₂ + 2Ag    ___________。

(2)2C₂H₂ +5O₂4CO₂+2H₂O    ___________。

(3)6H₂O +6CO₂C₆H₁₂O₆ +6O₂   __________。

(4) CaCO₃CaO +CO₂↑  ___________。

书面表达。

      假设你是李华,请根据下图提示,给美国笔友Peter写一封信,介绍你校学生的课外生活,并

谈谈你的感受。

     注意: 1. 信的开头和结尾已写好。

              2. 词数不少于60。

Dear Peter,

      How are things going? Now I'd like to tell you something about our out-of-class activities. ____

________________________________________________________________________

     I hope to know more about your out-of-class activities. Looking forward to hearing from you.

                                                                                                                                Yours sincerely

                                                                                                                                       Li Hua