关于加速度的物理含义，下列说法正确的是[ ]

A. 加速度表示速度增加

B. 加速度表示运动的快慢

C. 加速度表示速度变化的快慢

D. 加速度表示速度变化的大小

短文改错

    假定英语课上老师要求同桌之间修改作文,请你修改你同桌写的以下作文,文中共有10处语言错误,每句最多有两处.错误涉及一个单词的增加,删除和修改

增加:把缺词处加一个漏字符号(∧),并在其下面写出该词

删除:把多余的词用斜线(＼)划掉

修改:在错的词下划一横线,并在该词下面写出修改后的词

注意:

1.每处错误极其修改均限一词

2.只允许修改10处,多者从第11处不记分

Dear Jin Jing,

     Your problem is common one among middle school students. Maybe the following advices can

help you. First in all, believe in yourself. Your greatest problem is that you lack self-confidence. The

first thing you must do it is to smile at your classmates. One smile speaks loud about your wish to

make friends than any words. Your smile will show that you are friendly to him. Next, trying talking

with a student who is as shy as you or who share the same interest with you. You can discuss your

studies with a classmate and you can also talk about your hobbies. Unless anyone is in trouble, you

should be ready to help him or her. Once you have confidence, you can make as many friends as

possibly.

                                                                                Yours,

                                                                                  Lily

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