下列关于生态工程的叙述，错误的是（　　）

推理填空：
如图，已知∠1=∠2，∠B=∠C，可推得AB∥CD．理由如下：
因为∠1=∠2（已知），且∠1=∠4（①理由：____ ）
所以∠2=∠4 （等量代换）
所以CE∥BF （②理由：____ ）
所以∠C =∠3（③理由：____  ）
又因为∠B=∠C（已知），
所以∠3=∠B（等量代换）
所以AB∥CD （④理由：____ ）

心肌梗死是由于冠状动脉____，血液____引起的疾病，严重的危及生命。

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。

    I'm a huge book-lover but like sharing my love for books! So I've been bought books constantly. Finishing reading one book, I placed it in or around my school so that some of my schoolmate can enjoy themselves when reading it. I especial like placing it on a stone table in the little garden in that students might have time to take a rest. I was delighted an other day when I saw a card left on the table to say thanks. And from the card, I knew my book turned out of to be a birthday gift for a strange girl. It was so lovely find out that my book could bring anyone pleasure!