第四部分：写作（共两节，满分35分）

第一节：短文改错（共10小题；每小题1分，满分10分）

增加：在缺词处加一个漏词符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（╲）划掉

修改：在错的词下划一横线，并在该词下面写出修改后的词

One evening, Helen was preparing her examination in the basement of the house. Her parents had gone out shopping. Suddenly, he heard footsteps on the floor below. Known that she was the only person at home, she was frightened. Obviously, a thief has come in through the window that had been left opened for fresh air. Picking up her courage, Helen took a toy gun from the cupboard and went to upstairs. On her way, she shouted, “George, take the dog out.” To frightened the thief, she turned off some lights. The thief must have heard all the noises but rushed out through the window where he came in. Now, Helen felt somewhat relieved.

由于物质发生激烈的化学反应，使压力急剧上升而引起的爆炸称为（）。