某人站在穿衣镜前1m处，他在镜中的像到镜面的距离是______m，当他距镜面1.

阅读理解。

    One Sunday morning, I decided to buy a computer to use forschool. I went to the biggest store in town, which sold all kinds of computers. There were so many computers there that I didn't know how to choose a right one.

    "Hi! What  can I do  for you?" A young  man  greeted  me with a sweet  smile. He looked  like  not  a

salesman but a student like me. I sensed a strange feeling -- as if I had met him before. He began patiently showing me each model. With his help, I decided to buy one computer with enough functions at a very low price. I enjoyed this shopping experience because of his smile. A few months later, something was  wrong with my computer. I went back to the store to have it fixed. When I arrived there, what I saw was  still his

smile. As soon as I told  him my problem, he comforted  me  immediately and t ried his best to  solve  the

problem for me. I was quite grateful for his sweet smile and good service.

    When I went back to school, his smile often appeared in my mind. I don't  know  whether  we'll  meet

each other again, but his sweet smile will stay there in my  memory and  deep  in my  heart.  Smiling  is  the

most peaceful language in the daily life.

1. After reading the story, we can know that the writer is a __________.

A. student

B. salesman

C. doctor

D. reporter

2. According to the passage, why was the writer grateful to this salesman?

A. Because the salesman recommended the cheapest computer.

B. Because the salesman gave the writer his sweet smile and good service.

C. Because the salesman recommended the computer with enough functions.

D. Because the salesman showed how to use the computer correctly.

3. What does the writer mainly want to tell us in the story?

A. The way to choose a right computer.

B. The way to use a computer correctly.

C. The importance of smiling in the daily life.

D. The importance of computers in the daily life

营养评估包括（）。

A.影响因素的评估

B.生化评估

C.饮食评估

D.身体评估

E.摄入评估

已知函数f（x）=xlnx．

（1）求函数f（x）的极值；

（2）设函数g（x）=f（x）-k（x-1），其中k∈R，求函数g（x）在区间[1，e]上的最大值．

雷达采用微波的原因是（　　）

A．微波具有很高的频率

B．微波具有直线传播的特性

C．微波的反射性强

D．微波比其它无线电波（长波、中波、短波等）传播的距离更远

       班级要进行《青春随想》综合性学习，你所在的小组承担了搜集有关青春的影视、歌曲、书籍和名言的任务，你做了吗？请任选两项，把你搜集的结果写在题后的横线上。

       ①青春的影视：A．______________ B．______________。

       ②青春的歌曲：A．______________ B．______________。

       ③青春的书籍：A．______________ B．______________。

       ④青春的名言：A．______________ B．______________。