短文改错。便条中共有10处错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（∧）。并在其下面写出修改后的词。
删除：把多余的词用斜线（＼）划掉。
修改：在错的词后划一横线,并在该词下面写出修改后的词。
注意：1）．每处错误及修改均仅限一词;
2）．只允许修改10处,多者（从第11处起）不记分。
    One day, I was cooking in the kitchen when the telephone rings. I went to answer it immediately. She was my close friend, Lisa. When we were talking on a phone, the fire alarm sounded. I dashed back to the kitchen. The room full of smoke and the beef was bad burnt. I quickly turned off the gas, opening all the windows, and then rushed out of the house. In my surprise, two fire engines were outside my house. I was rather worrying. I told about the firemen that it was my careless cooking which caused the heavy smoke.

下图分别是三种生物细胞的结构模式图，有关叙述正确的是（    ） 

一幅美丽的图案，在某个顶点处由四个边长相等的正多边形镶嵌而成，其中的三个分别为正三边形，正四边形，正六边形，则另外一个为（   ）

人体生长发育的起点是（   ）

由6个千、7个百和3个一组成的数写作____，这个数是____位数．