如图的裤架有4个夹子，其中一个夹子已经夹住了毛巾的一个角，为了使裤架在水平位置平衡，那么毛巾另一个角应该夹在 ____ 号夹子上。

     A woman is having some trouble(患病) with her eyes, so she goes to see the doctor. He is a new doctor and doesn’t know her, so he asks some questions and one of them is, “How old are you?”

     The woman says, “I don’t know, doctor, but let me think about it.” She thinks for a few minutes and then says, “Yes, I know now, doctor! When I marry(结婚), I am eighteen years old, and my husband is thirty. Now my husband is sixty. And that is twice(两倍) thirty. So I am twice eighteen. That’s thirty-six, isn’t it?”

Can you ____(need/ read) the list for the old man?

我国最大的气候灾害是（　　）

极坐标方程r=2sinθ和参数方程$\left\{\begin{array}{c}x=2+3t\\ y=-1-t\end{array}\right.$(t为参数)所表示的图形分别为(   )