在mA（气）＋nB（气）pC（气）＋qD（气）反应中，经10min达平衡，此时各物质的浓度变化为：A减少amol/L，B减少a/3 mol/L，C增加2a/3 mol/L，此时若给体系加压，化学平衡不移动，则m：n：p：q为                           [ ]

A.1：1：1：1                        

B.1：3：3：1

C.1：3：2：2                        

D.3：1：2：2

改错

下面短文中共有10处错误，每句最多有两处.错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号(∧)，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10处，多者(从第11处起)不计分。

     Thank you very much for invite me to your birthday party in Saturday morning. I'd like to

come and I have to go to my hometown to see my grandparents. They were very old and unluckily

they are not in a good health recently. My mother has already made a telephone calling to them

and promised visit them with me this Saturday. My mother said we will stay at my grandparents'

the whole weekend. So I'm real sorry I can't attend your party. I do hope you will understand all

this. Here I wish you a lot fun on your birthday and many happy returns of the day.

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