在"画图"工具中，可以实现的操作为（）A、制作动画 B、播放视频 C、图像填充 D、三维图

短文改错

     假如英语课上老师要求同学们交换修改作文， 请你修改你同桌写的以下作文。文中共

有10处语言错误，要求你在错误的地方增加、删除或修改某个单词。

增加：在缺词处加出加一个漏字(∧)，并在其下面写上该加的词。

删除：把多余的词用斜线(\\)划掉。

修改：在错的词下划一横线, 并在该词下面写上修改后的词。

注意：

1. 每处错误及其修改均仅限一词；

2. 只允许修改10处, 多者(从第11处起)不计分。

     When I walked into the classroom, the teacher was handing in the exam papers. I was feeling very

nervously . I had not studied at all at the weekend as I had thought it would be easy test. I went

through the test for many times but I could only answer three out from the twenty questions. I did not

want to fail the exam. Then , I put my book under my desk, opening it and started looking for the

answer. The teacher wasn't looking at me, but I copied something. Suddenly, I felt a hand on my

shoulder! The teacher caught me cheating. I don't know what to say.Luckily, the teacher did not punish for cheating but instead gave me a second chance.

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硝酸异山梨醇酯的作用是（）

A．扩张小静脉

B．扩张小动脉

C．二者均有

D．二者均无

基于如下叙述：关系模式Student(Sno,Sname,Cno,Cname,Grade,Tname,Taddr)的属性分别表示学号、学生姓名、课程号、课程名、成绩、任课教师名和教师地址。其中，一个学生可以选修若干门课程，一个教师可以讲授若干门课程，一门课程可以由若干教师讲授，一个学生选修一门课程时必须选定讲授课程的教师，教师不会重名。

关系模式Student的候选关键码有（）。

A．1个，为 (Sno, Cno)

B．1个，为 (Sno, Cno, Tname)

C．2个，为 (Sno, Sname, Cno) 和 (Sno, Cno, Tname)

D．2个，为 (Sno, Sname, Cno) 和 (Sname, Cno, Tname)

微生态疗法(microecosystemtreatment)

心理平衡的三个快乐是什么？