搜题请搜索小程序“爱下问搜题”
问题 选择题

含有硫的煤，在火炉中如果不完全燃烧，则排放出能污染空气的有毒气体是 [ ]

A.SO2和CO2    

B.SO2     

C.CO     

D.SO2和CO

答案

答案：D

选择题

“×”代表河水自外向里流入，“·”代表河水自里向外流出，判断四幅图中正确的是(  )
查看答案
改错题
短文改错。
     此题要求改正所给短文中的错误。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。
Dear Ms Smith,
     I'm Li Hua from a Student Union of Yucai Middle School.
We were organizing an art exhibition for high school students
in our city. It will be hold on the 9th of June in the Exhibition
Hall of Beihai. More than 1,000 painting will be on show,
but high school students and teachers from all the five districts
will come to the event. As you are very popularly with us
Chinese high school students, we'd like to invite for you
to the exhibition. We would be grateful when you could
join them that day. 
     I am looking forward hearing from you soon.
                                                            Yours,
                                                            Li Hua 		1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____
10. _____
查看答案