当你发现显微镜镜头不干净时，除去污物的正确方法是（　　）

一个三角形的两边长分别是2和3，若它的第三边长为奇数，则这个三角形的周长为____．

    Hello ,my friends.I 1_free this Sunday. We have no classes. I would like 2 out tor a picnic with my family on the farm. My mother and I do some shopping3 the morning. My mother buys some4,like bread and chicken . I buy5bags of milk. A bar of chocolate needs 11 yuan , but I buy five 6 50 yuan. Bananas are my7 I take a lot of bananas with 8.On the farm we see many rabbits. They are very9.I like them very much. We are all 10  on that day.

北京是极度缺水的城市。作为北京市民，下列生活习惯应该摒弃的是(  )

下图是加注部分经纬线后的微信登录界面，读图并完成下面小题。