下面哪项不宜用于巨细胞病毒感染的诊断（） A.宫颈脱落细胞涂片行Giemsa染色 B

短文改错。

     假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。

文中共有10处语言错误，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）不记分。

Dear Ms Smith,

     I am secretary of the City Student Union (CSU). We were organizing an art exhibition for high school

students in city. This will be held on the 9th of July in the Exhibition Hall of Beihai. More than 1000 paining

will be on show, but high school students from all the eight districts will come to the event. As you are very

popularly with us Chinese high school students, we'd like to invite for you to the exhibition. We would be

grateful when you could join them that day. Looking forward to hear from you soon.

                                                                                                                                           Yours,

                                                                                                                                           Li Ming

_______________________________________________________________________________________

一个工程，甲和乙单独做分别需要24天和32天，如果甲先做若干天后休息，乙接着做，这样共用27天完成，问甲、乙各做了多少天（）

A．7，20

B．13，14

C．15，12

D．11，16

You____________ this morning if you really wanted to see it yourself.

A．ought to come

B．mostly

C．almost

D．possibly

下列符号中，表示两个氢离子的是

A．H₂

B．2H

C．2H⁺

D．2H₂

缺铁性贫血红细胞直方图特点是（）。