请给学校里的下列场所设计几条标语，让学校充满文化气息。（可引用也可自创） 

例：食堂：谁知盘中餐，粒粒皆辛苦。

1．图书室：                                                                                                 

2．水池边：                                                                                                

3．自然实验室：                                                                                          

4．草坪：                                                                                                   

5．健身室：                                                                                                

继发性闭经是指月经停止（）

A．至少3个月

B．至少6个月

C．至少2年

D．至少12个月

E．至少3年