【名词&注释】
一氧化碳(carbon monoxide)、化学式(chemical formula)、元素化合价
[单选题]五氧化二碘（化学式为I2O5）常用来测定空气中一氧化碳的含量，I2O5中碘元素化合价为
A. －5
B. +5
C. +3
D. +2
查看答案&解析
举一反三：
[单选题]25_______．
A. difficult
B. possible
C. useful
D. different
[单选题]Which is true according to (根据)the passage?
A. The “Olympic Mathematics” is too difficult for kids.
B. The grandfather thinks playing is more important than learning.
C. Teachers often give students useless homework.
D. The parents don’t want their kids to do lots of homework.
[单选题]AMy name is Philip．Now I live in Beijing．On Sundays my father often takes me to movies． My favourite movies are action movies． My father likes them， too． Many young people like this kind of movies， because they are exciting． My good friend， Jim likes thrillers best． I don-t like thrillers． I think they are scary and boring． Jim likes Beijing Opera， too． And he wants to be a Beijing Opera artist．
A. When does Philip often go to movies with his father?
B. Sundays
C. Birthday
D. Festival
E. Mondays
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