图为带电微粒的速度选择器示意图，若使之正常工作，则以下叙述哪个是正确的（   ）

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.

下列哪项不是近几十年来大气中CO₂浓度增加的原因（　　）