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【简答题】
（4分）在氮气、氧气、二氧化碳、二氧化硫气体中，按要求将相应物质的化学式填在题中的空白处。 （1）属于空气污染物的气体是_______； （2）能支持燃烧的气体是_______； （3）焊接金属时常用作保护气的是_______；（4）绿色植物光合作用吸收的气体是_____。
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举一反三
【单选题】The recitation of a poetry by the teacher or a student in the classroom ______.
A.
is the best way to understand it
B.
easily arouses some discussion among the students
C.
helps the teacher to analyze it
D.
cannot take the place of the poet reading it
【简答题】Her necklace was g____(闪烁;闪耀) with diamonds.
【单选题】The recitation of a poem by the teacher or a student in the classroom ______.
A.
is the best way to understand it
B.
easily arouses some discussion among the students
C.
helps the teacher to analyze it
D.
can not take the place of the poet reading it
【单选题】Janet is delighted _____ the first prize in the poem recitation contest.
A.
to award
B.
to be awarded
C.
to have been awarded
D.
to be awarding
【简答题】某商场工程建设项目招标，比较合理的招标顺序是（ ）。
【简答题】A．Effortless B．Impossible C．Difficult D．Unnecessary
【简答题】华为荣耀5X手机怎么开启/关闭收到通知时指示灯闪烁的功能？如何设置指示灯？
【单选题】The recitation of a poetry by the teacher or a student in the classroom ______.
A.
is the best way to understand it
B.
easily arouses some discussion among the students
C.
helps the teachers to analyse it
D.
can not take the place of the poet reading it analyse
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