以下选项中对保护历史文化名城原则说法错误的是( )。A．一般保护，重点保护 B．系

因式分3x³-6x²y+3xy²=______．

短文改错（共10小题；每小题1分，满分10分）

以下标有题号的每一行均有一个错误，请找出，并按下列情况改正：

此行多一个词：把多余的词用斜线（╲）划掉，在该行右边横线上写出该词，并也用斜线划掉。

此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。

此行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。

注意：请在答题卡上作答。

I was glad to accept your letter of June 22．                                     76．      ____ 

I don’t expect that you would answer my letter so                                             77．           

soon．You suggested in letter that I read more, to                                            78．           

which I agree．That is true that one should read                                      79．           

much to improve his reading．It is the same like                                       80．           

swimming．One can’t learn to swim if he goes and                                           81．           

swim in the water．So this summer vacation I am                                             82．           

going to get down to read some books．Although                                             83．           

I am not the kind of person always does things                                                    84．           

according to his plan, but I will try my best．                                                       85．           

关于基因突变说法不正确的是（）

A.基因突变定期发生在减数分裂过程

B.基因突变的频率很低

C.有些基因突变对生物体是有益的

D.基因突变是不定向的

什么是劳动争议仲裁时效期间的中止？中止的法定事由有哪些？有何法律后果？

清暑益气汤(《温热经纬》)和竹叶石膏汤组成中均含有的药物是（）

A.甘草粳米石膏

B.甘草粳米竹叶

C.麦冬人参竹叶

D.半夏麦冬黄连

E.麦冬石斛半夏