根据《倒置式屋面工程技术规程》JGJ230的要求，水落口应采取（）措施，应防止杂物堵塞。

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