试题与答案

在水溶液中,YO3n-和S2-发生如下反应:YO3n-+ 3S2- +6H+ =

题型:选择题

题目:

在水溶液中,YO3n-和S2-发生如下反应:YO3n- + 3S2- +6H+ = Y- + 3S↓+ 3H2O,则YO3n-中Y元素的化合价和原子最外层电子数分别为( )

A.+4、6

B.+7、7

C.+5、7

D.+5、5

答案:

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阅读短文,根据短文内容,在表中填入相应信息(每空不超过三个单词,共5小题,每小题2分))
Learning a new language isn’t easy. For many of us, speaking the language is even harder! Here are some tips(建议)to help you become more comfortable speaking English.
Tip 1  When you study, make your mouth do what your mind is learning. If you read aloud, you make your mouth and your mind work. This will help you with both speech and pronunciation.
Tip 2 Talk to yourself as much as possible. You need to be comfortable making sounds in English. All over the day, talk to yourself in English! This will help you feel comfortable thinking in English. Then write down what you are saying and read it aloud.
Tip 3  Have a “study partner”.Get together with him or her at least once a week and study together. Speak as much English as you can whenever you meet. Then you can help each other.
Helping yourself talk in English
Tips
What to do
Why
1
If you 小题1: ,you make your mouth and your mind work.
Help you with speech and pronunciation.
2
Talk to yourself 小题2: possible. And then write down what you are saying and read it aloud again.
Help you 小题3:thinking  in  English.
3
Have a“ 小题4:.”Get together with him or her at least once a week and study together.
You can help小题5: .
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