问题 选择题

下列说法正确的是(  )

A.质子数相同的微粒,一定是同种元素

B.最外层电子数相同的微粒,一定是同一种原子

C.具有稳定结构的微粒,一定是稀有气体元素的原子

D.同种元素的原子,质子数一定相同

答案

A、根据NH4+和Na+,都是11个质子,虽是质子数相同的微粒,不是同种元素;故A说法错误;

B、根据钾离子与氯离子是最外层电子数相同的微粒,不是同一种原子;故B说法错误;

C、根据氯离子的最外层电子数为8,不是稀有气体元素的原子;故C说法错误;

D、根据不同种元素之间的本质区别是质子数不同,所以同种元素的原子,质子数一定相同;故D说法正确.

故选D.

选择题

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的错误。对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词 :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。该行缺一个词: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。该行错一个词: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正。

Dear Editor,

Recently, my classmates have had a heated discussion about that     

小题1:_______

we should have optional courses(选修课) in high schools. Some students were 小题2:_______

in favor of the optional courses. They say interest is the best teacher   小题3:______

and our spare time will be colorful and meaningful. Students        

小题4:_______

can not only enlarge their knowledges but also improve their abilities.   小题5:_______

However, others are against the idea, said that optional courses         小题6:_______

will take up too much time as well as energy. In addition to, some optional

小题7:_______

courses have something to do with the College Entrance Examination. They   小题8:_______

are afraid they’ll fall behind their classmates if they will take the optional 小题9:_______

courses. I’d like to take one or two of the optional courses, which, I think,

will certain benefit me a lot.                                     

小题10:______

单项选择题