问题 选择题

化合物A为一种盐,分析表明A中部分元素的质量分数为:Cu 39.50%、N  8.64%,其余为H、O、S.A与NaOH混合时有能使湿润的红色石蕊试纸变蓝的气体产生,则A的化学式为(  )

A.CuNH4SO3

B.Cu(NH42(SO42

C.Cu3(NH42(SO43

D.Cu(NH42(S2O32

答案

因A与NaOH混合时有能使湿润的红色石蕊试纸变蓝的气体产生,

则气体为氨气,即A中存在铵根离子,

又A中Cu的质量分数为39.50%,N的质量分数为8.64%,

则Cu与N的原子个数比为

39.50%
64
8.64%
14
=1:1,

选项中只有CuNH4SO3符合Cu与N的原子个数比为1:1,

故选A.

改错题

第II卷(选择题,共50分)

第三部分:写作(共两节,满分50分)

第一节:短文改错(共10小题,每小题1.5分,满分15分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画上一个勾“√”;如有错误(每行只有一个错误),则按下列情况改正:

此行多一词: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上该加的词;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:原行没有错的不要改。

Der Jenny,

Thank you inviting me to holiday with you . I           66.___________

would have glad accepted your invitation, but            67.___________

now I am afraid I can’t. Yesterday I received a letter     68.___________

from my parents in which he said they hadn’t seen me     69.___________

for long and hope therefore I could be back at home for  70.___________

a while. I hope you can understand this. I have long       71.___________

absent from home but sometimes I felt lonely. I believe         72.___________

you have the same experience either. Thank you and, most  73.___________

important, don’t forget to let me to know and take me along      74.___________

when in future days you are to seeing some good movies,   75.___________

and go picnicking. May you have a happy holiday!    

Yours,

Wang Fang

单项选择题