问题 填空题

在反应4HNO3

 光照 
.
 
4NO2↑+2H2O+X↑中,X的化学式为______.

答案

根据质量守恒定律,反应前:氢原子:4,氮原子:4,氧原子:12;反应后,氢原子:4,氮原子:4,氧原子:10,X的化学式中应含有H的个数为:4-4=0,应含有氮原子的个数为:4-4=0,应含有氧原子的个数为,12-10=2,故X的化学式为O2

故答案为:O2

完形填空
Once I went shopping on my first visit to Macao. Coming from cold and cloudy England, I enjoyed the sun and dressed in a T-shirt and a        skirt. Not having much        to enjoy the sun in England, my legs were very white. In England this is not a fashionable look at all . Most women spend every sunny day out trying to get darker skin. The darker the skin, the better the look. I have tried to get darker but         works for me!
As I        one shop, the two shop assistants kept looking at my legs the whole time , talking quietly to each other in Chinese. I began to feel uncomfortable and asked my friend     we could leave. After we left the shop, she asked me what was wrong. I complained about the shop assistants being very impolite . They     be talking about my white skin. My friend laughed. “They weren’t laughing at you. They were saying how nice your legs are. Many Chinese women want to have white skin like yours.       , there are many beauty products in the shops to make skin whiter and a lot of money is spent on them.”
It just shows that we are never happy with what we have. The grass is       greener on the other side. If the women of the West and East        the same way, Western women wouldn’t spend so much money on cream that makes skin darker and women from the        wouldn’t need to use cream that makes skin whiter.
小题1:
A.longB.shortC.beautifulD.expensive
小题2:
A.moneyB.exerciseC.spaceD.chance
小题3:
A.anythingB.everythingC.nothingD.something
小题4:
A.broke intoB.ran pastC.got out ofD.walked around
小题5:
A.thoughB.andC.butD.if
小题6:
A.mustB.mustn’tC.canD.needn’t
小题7:
A.In a wordB.In the endC.InfactD.In order
小题8:
A.neverB.alwaysC.everD.seldom
小题9:
A.thoughtB.sawC.workedD.decided
小题10:
A.EastB.WestC.SouthD.North
选择题