题目

根据对话内容, 从选项中选择恰当的选项补全对话，其中有两项是多余的。A: Hello! You’re new in our school. 【1】 B: I’m from Thailand.A: Thailand? I know the elephant is the symbol of Thailand.【2】B: Because we think a white elephant can bring us good luck.【3】A: What do you mean by that?B: People say that “elephants can remember things”. They never forget.A: But there are fewer and fewer elephants in the world now.B: Yes.【4】We must do something to save them.A: What can we do to help?B:【5】 And don’t cut down trees.A.They are in great danger.7．已知抛物线C：y2=6x的焦点为F，P为抛物线C上任意一点，若M（3，$\frac{1}{2}$），则|PM|+|PF|的最小值是（　　）A．$\frac{11}{2}$B．6C．$\frac{7}{2}$D．$\frac{9}{2}$