《本草衍义》中对精制砒霜过程有如下叙述：“取砒之法，将生砒就置火上，以器覆之，令砒烟上飞着覆器，遂凝结累然下垂如乳，尖长者为胜，平短者次之．”文中涉及的操作方法是（　　）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

注意：每句只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（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）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。
①All hope was no lost.
②The two millions people of the city were asleep as usual that night.
③In the farmyards, the chickens and even the pigs were very nervous to eat.
④It seemed as if the world was at end.
⑤She loves the boy as if she was his mother.