如图，矩形ABCD中，AB＝4，BC＝5，AF平分∠DAE，EF⊥AE，则CF等于

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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。

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。

    When I was still young in my high school, my mother dragged me to play basketball to lose weight. However, it was turned out to be a bitter failure because I devoted my time on study. One day, a friend of mine contacted me and suggested that we started to swim. Without any hesitation, I agreed because we all thought that it was coolest thing in the world. I couldn't forget the day on that I was thrown into the cold water. Fortunately, I survived. Honest speaking, I had a hard time recovered from the shock. Then my friend teaches me to hold my breath underwater. Finally, I succeeded. Now realizing that taking exercises is beneficial to my health, I develop a strong taste for swimming, which becomes part of my life.

下列与免疫失调无关的疾病是（　　）

绿色开花植物完成受精作用后，花的各部分发生了明显的变化．下列变化中正确的是（    ）