患者，男，15岁，面型略突，面下1／3高，ANB2°，下颌支发育不足，前牙切牙合。上

Before writing a book, the first thing is considering what to say.()

A. you must first ponder what to say and what not to be said carefully

B. it’s extremely necessary that you know what to say

C. the first thing is to consider what to say

D. you must first ponder what to say and what not to say

在平面直角坐标系中，抛物线经过点（-2，0）（1，0）（0，2）

（1）求二次函数的解析式；

（2）写出顶点坐标和对称轴．

截止阀、闸阀、止回阀都属于切断阀。（）

假如你是某英语报社“烦恼和我说”栏目的编辑Linda，收到中学生David 的来信。请你阅读这封信后，给他回信。词数：120左右。

Dear Ms Linda,

Though living in a wealthy family, I don’t feel as happy as other boys because I’m forbidden to do what I want to ,such as surfing the Internet, playing with my friends, buying what I want , and so on. My parents ask me to study all day. I feel they are too hard on me . I often feel upset as I have no freedom. What shall I do ? I will greatly appreciate it if you could give me some advice.

Yours,

David

回信应包括以下两个要点： 1。简述自己的类似的经历；

2．提出至少两条建议。

海运提单的种类很多，从不同的角度可以分为不同类型，其分类标准包括( )。

A．货物是否已装船

B．提单上有无对货物外表状况的不良批注

C．收货人抬头不同

D．风险水平不同

E．运输方式不同