在德化红酒制作的过程中，要尽量少打开容器，主要原因是为了防止（　　）

下面语段，已打乱顺序，最佳排列顺序是 (       )
①新形势下大力开展学雷锋活动有助于激发人们思想道德建设热情，激扬人们心中蕴藏的美好思想品德。
②雷锋精神，是以雷锋的名字命名的、以雷锋的精神为基本内涵的、在实践中不断丰富和发展着的革命精神。
③雷锋同志是中国家喻户晓的全心全意为人民服务的楷模。
④此外，也能解决道德领域突出问题，匡正道德失范，矫正诚信缺失，提升社会道德水平。

Last term,Peter was ____ at home.His parents were doing busines in another city. He felt lonely,so he often turned on the computer and played computer ____. However, sitting in front of the computer for a long time is ____ for him. And he spent little time on his study.He failed his exams.Luckily,his parents ____ his problem in time.They decided to come back home.Peter studies hard now.So far,he has made progress in his study.He ____ he can catch up with his classmates soon.

如图，在△ABC中，AB=AC，DE是过点A的直线，BD⊥DE于D，CE⊥DE于点E；

（1）若B、C在DE的同侧（如图所示）且AD=CE．求证：AB⊥AC；

（2）若B、C在DE的两侧（如图所示），其他条件不变，AB与AC仍垂直吗？若是请给出证明；若不是，请说明理由．