如图所示，程序框图的输出结果是（   ） A．    B．    C．    D．

A．x≠2　　　B．x≠-2　　　C．x>-2　　　 D．x<2

 (2013年浙江五校联考)将地面上静止的货物竖直向上吊起，货物由地面运动至最高点的过程中的v－t图象如图所示。以下判断正确的是

A．前3 s内货物只受重力作用

B．最后2 s内物体的位移大小为12m

C．前3 s内与最后2 s内货物的平均速度相同

D．第3 s末至第5 s末的过程中，货物的机械能守恒

Both of my parents worked full-time when I was a little girl, so my grandmother would stay at our house during the day. We would watch game shows in the living room. Our favorite was The Price is Right. We would call out our answers along with the contestants.

When I got older and started going to school, we couldn't watch our game shows regularly. That was okay with me, though, because the one thing I liked better than watching game shows with my grandmother was helping her bake cakes. Watching her in the kitchen was amazing: she never seemed to need the recipes but everything she made tasted delicious.

    At first I would just sit in the kitchen and watch, even though I didn’t understand what she was doing, As I got older, she let me help with the easy parts, such as measuring the sugar. The day she let me separate the eggs, I felt like I had found complete pleasure.

    At last, my parents decided that I could take care of myself, and my grandmother stopped coming over every day. The love of baking, however, stayed with me. I started baking by myself, and even if the cookies ended up burnt sometimes, more often they turned out pretty well. I tried out new recipes, and whenever I got to a thorny part, I would call my grandmother for advice. Sometimes I would call her just to talk, too. I felt like I could talk to her about anything.

    My grandmother passed away ten years ago, but I still think of her every day. Last week, I found a recipe book she made for me. It included her recipes for brownies, cookies, and my favorite, lemon pie. As I looked through the pages, I thought I could hear her voice. She was the one who taught me not just about baking, but about life.

21. What’s the author’s purpose in writing this passage?

   A. To show her good baking skills.           B. To remember her grandmother.

   C. To talk about her happy family life.      D. To describe her childhood memories.

22. While helping her grandmother bake, the author ______.

   A. found it interesting and appealing        B. turned out to be a troublemaker

   C. hoped to make a living by baking      D. regretted missing the game shows

23. What does the underlined word "thorny" in Paragraph 4 most probably mean?

  A. basic.        B. common.           C. special.     D. difficult.

24. The passage is mainly developed by ______.

  A. analyzing causes                       B. making comparisons 

C. following the time order                   D. examining differences