问题 选择题

雄伟壮观的国家大剧院主体建筑表面安装了近2万块钛(Ti)金属板。已知Ti原子核内有22个质子,则下列叙述正确的是

A.TiO2中含有氧分子

B.钛原子的相对原子质量为22

C.Ti可以表示一个钛原子

D.CaTiO3属于金属氧化物

答案

答案:C

A、TiO2中含有氧元素不含有氧分子,故A错误;

B、钛原子的相对原子质量=质子数+中子数,所以钛原子的相对原子质量不为22,故B错误;

C、Ti可以表示一个钛原子,故C正确;

D、CaTiO3属于盐,不是氧化物,氧化物只有两种元素,故D错误.

改错题
短文改错。此题要求改正所给短文中的错误.对标题号的每一行做出判断:如无错误,在
该行右边的横线上划(√);如有错误(每行只有一个错误),则按下列情况改正:
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:原行没有错的不要改。
     Some students don’t like talking about their parents           
often as if their parents love them very much. Are you           
going on well with your parents? You and your parents            
will be very happy if you can be friends. Here were some          
way to have  a good talk with them. Find a good time to        
talk, like when you’re eating dinner, going out for walk        
and watching TV. Tell them something you’re interested       
in, or ask them about their lives when they are young. They      
love to talk about our past! Meet them face to face and          
listen to them carefully. Be honesty, and your parents will      
trust you more.                                                
1. ______          
2. ______       
3. ______            
4. ______          
5. ______             
6. ______                   
7. ______           
8. ______            
9. ______          
10. ______     
单项选择题