x、y、z三种物质的分子组成分别符合烷烃、烯烃、炔烃的通式，若_爱下问搜题

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问题选择题

x、y、z三种物质的分子组成分别符合烷烃、烯烃、炔烃的通式，若在一定条件下V L

的x、y、z的混合气体可与V L H₂发生加成反应，则混合气体中x、y、z的体积比可能是

①1:1:1 　②1:2:3 　③1:4:1 　④3:2:1

A．①③

B．②③

C．③④

D．①④

答案

答案：A

题目分析：烷烃不能和氢气发生加成反应，烯烃和氢气1:1加成，炔烃和氢气1:2加成，按照所给比例代入检验混合气体体积和氢气体积比是否符合1:1，A、混合气体体积为1+1+1=3，氢气体积为烯烃消耗1，炔烃消耗2，即1+2=3，符合1:1，正确；B、混合气体体积为1+2+3=6，氢气体积为2+6=8，不符合1:1，错误；同理， C、D错误。

完形填空

I have always wanted to share this story because it is one of the things that I will remember for my entire life. And I’m sure      person feels the same.
We had a new teacher in my high school World History class. She was very nice and excited to see us. She told a story about her      fighting in a war and brought a picture of him. After about fifteen      of her talking, the class started talking softly to each other       they were getting bored. Looking      , she asked “So, you guys don’t really want to hear any more?” No one dared to actually say “no” to her out loud      one kid. He said, “No, not really!” in a disrespectful way. Some kids were a little      and thought that it was rather rude.
I felt extremely bad for this teacher. No one deserves to be      in such a disrespectful manner.     , a little before class let out, I went up to her and      for the guy’s rude behavior. I told her I had been     , and even though I may not entirely like     , I did appreciate her sharing her story. I asked her      about her father and asked to see the picture of him. We had a very nice, genuine conversation about her father.
The teacher was     . She really appreciated me coming up and actually treating her with the       that she deserved. I felt at full peace with myself knowing that I did the right thing and I was super happy that I actually     . Even though I didn’t really care for history, I      listened, and I hope that others in different situations will do the same. Listening means a lot to the people sharing; it really     . If I had just left the class without saying a word, I would have felt extremely      and would have a constant reminder, probably to this day, that      was not served and I had left a person in their time of need.

C．disappointed

C．architecture

C．embarrassed

A．made her day

B．made my day

C．made her way

D．made my way

单项选择题 A3/A4型题

患者女性，36岁，既往乙肝病史20余年，平素监测肝功能正常。本次因"全身黄染伴乏力5天，神志改变1天"入院。查体：神志朦胧，全身皮肤及巩膜黄染，未见肝掌、蜘蛛痣，肝脾肋下未及；血总胆红素455μmol／L，直接胆红素275μmol／L，ALT1357U／L，AST2357U／L。

该患者肝功能损害的病因最可能是（）

A.病毒性肝炎

B.中毒

C.血吸虫

D.胆石症

E.妊娠脂肪肝