增加：在缺词处增加一个漏字符号（^）并在其下面写出该加的词

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在改词下面写出修改后的词。

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。

    I couldn’t believe my ears when I heard my name calling. I was chosen to play the leading role in a play, that was my dream. As a shy and thin girl, I used to being quite afraid of speaking in the public. But my parents and teachers always encouraged me to do so. What they said had a deep influence of me. By now I changed greatly. In class, I am often the first one to stand up and answer questions even if I may take some mistakes. Now I am delightful that I’m brave enough to overcome the difficulty in my heart. My experience shows that we should not be afraid of losing face but only in this way can we make progresses.

甲升降机比乙升降机的机械效率高，他们分别把相同质量的物体匀速提升相同的高度，则（　　）

某科技公司凭借互联网思维、扁平灵活的管理架构和独特的供应链能力，成为互联网时代的新宠，仅用5年时间跃升为世界第三大智能手机生产商。材料表明(   )

正方体$ABCD-A_1{B}_1{C}_1{D}_1$的棱长为1，线段$B_1{D}_1$上有两个动点$E,F$，且$EF=\frac{\sqrt{2}}{2}$，则下列结论中错误的是(     )