单项选择题：HDL测定第一步是从其他脂蛋白中将其分离，最常用的方法是（）。A.超速离心法 B.凝

题型：单项选择题

该文中共有十处错误,每句中最多有两处,错误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。

注意：1、每处错误及其修改均仅限一词；

2、只允许修改十处, 多者（从第11处起）不计分。

Dear Li Mei,

With the mid-term exam come, you must get prepared for them．I think that you need is a right study

method．As we all know, there are three stage in study--- preview, study in class and review, among which review was the most important．You should first make a review plan, then stick to it．

I follow my review plan strictly and have made a progress in my study．It turns out to be good

enough．Of course, there are more than one way to review．So long as you review regular, I’m sure you can find more ways to study well．

If you have any question of subjects, you may ask me I’m glad to help you．We may meet in our

school library every Friday afternoon．

Best regards．

Yours,

Li Hua

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HDL测定第一步是从其他脂蛋白中将其分离，最常用的方法是（）。A.超速离心法 B.凝

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