已知椭圆C：9x²+y²=m²（m＞0），直线l不过原点O且不平行于坐标轴，l与C有两个交点A，B，线段AB的中点为M．

如图，已知AB=AD，∠1=∠2，要使△ABC≌△ADE，还需添加的条件是（只需填一个）

____．

下列是显微镜在使用过程中遇到的问题与对应的解决办法，正确的是（    ）

阅读理解
A
    Jennifer and William live in New York．They have a daughter, Emma，but 3-year-old Emma doesn't live with them．She is in California with her grandparents．It is Jennifer's birthday today．Jennifer and William come to a nice restaurant to celebrate (庆祝)．
Waiter：Good evening，how can I help you today?
William：We'd like a table for two, please．
Waiter：This way，please．
Jennifer：Thank you．Can we have a menu(菜单)?·
Waiter：Here you are．My name is Alan．I'm your waiter today．Would you like to hear today's specials?
William：Sure．
Waiter：Well．today's specials are chicken soup and fish and chips(炸鱼薯条)．
Jennifer：OK．I'd like fish and chips．
William：I would like to have pasta （意大利面食）with tomatoes．
Waiter：OK．Would you like to have some salad? Our salads are great．
Jennifer：I'd like a green salad．
Waiter：Very good．Would you like something to drink?
Jennifer：Oh．Water is OK．
William：I would like some orange juice，please．
Waiter：OK．So that's a green salad, fish and chips and water, pasta with tomatoes and orange juice.
Jennifer：Yes，that's right．
根据材料内容选择最佳答案。

水痘病毒侵入人体，使人患上水痘，痊愈后，此人就不会再患水痘了，这种免疫属于（　　）