____ 、____ 和____ 是严重威胁人类生命和健康的不良行为．

把函数y=3sin2x的图象向左平移$\frac{\mathrm{\pi }}{6}$个单位长度，得到函数（　　）

增加：在缺词处加一个漏字符号( )，并在其下面写出该加的词。

删除：把多余的词用(＼)划掉。

修改：在错的词下画一横线，并在该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。

    Last Friday I saw the worst weather in years. In the morning, the sun was completely blocked so that I could see something clearly. I stayed at home, look outside. That came into sight was a flash of lightning. Seconds later, the noise of thunder broke the silent. Then a strong wind starts to blow into my room. Pieces of paper on my desk was blown high into the air and some flew out the open window. Then I closed the window when it rained hard and near broke my window.

    What a bad weather! I hate it so I can't go out to play.

设命题设命题$p$：$\exists n\in N$，则$n^2$＞$2^n$，则$\neg p$为(     )