试题与答案

下列叙述正确的是 ①人的皮肤在强紫外线的照射下将会失去生理活性 ②用甲醛溶液浸泡

题型:选择题

题目:

下列叙述正确的是

①人的皮肤在强紫外线的照射下将会失去生理活性

②用甲醛溶液浸泡海产品保鲜

③变质的油脂有难闻的特殊气味,是由于油脂发生了水解反应

④棉花和木材的主要成分都是纤维素,蚕丝和蜘蛛丝的主要成分都是蛋白质

⑤蜂蚁叮咬人的皮肤时将分泌物甲酸注入人体,此时可在患处涂抹小苏打或稀氨水

A.①④⑤

B.②③④

C.①②④⑤

D.全部

答案:

答案:A

题目分析: ①强紫外线可使人皮肤内的蛋白质变性;②甲醛可使蛋白质变性,从而杀死细菌和病毒,起到保鲜作用;③油脂的变质主要是被氧化;④棉花和木材的主要成分都是纤维素,蚕丝和蜘蛛丝的主要成分都是蛋白质;⑤甲酸可用小苏打或稀氨水中和;故选A。

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I used to be ashamed of my grandma. I know that's a 1 thing to say, but it was true until today, so I have to 2 it.
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Once she took Jill and me out to Burger King. 9   ordering our hamburgers well-done, she told the person behind the counter, "They'll have two Whoppers (巨无霸) well-to-do. " Jill burst out laughing, but I almost 10  .
After a while, I started wishing I could 11  Grandma in a closet. I even complained to my parents. Both my parents said I had to be careful not to make Grandma feel  12  in our home.
Then last Wednesday, something happened that 13  everything completely. My teacher told us to help find interesting old people and 14   them about their 15  for a big Oral History project. I was trying to think of someone when Angie pushed me gently.
"Volunteer your grandmother," she whispered. "She's 16  and rich in experience."
That was the last thing I ever thought Angie would say about my grandma.
This is how I ended up on  17  today interviewing my own grandmother before the whole school assembly (集合). All my friends and teachers were listening to her  18  she was a great heroine. I was  19  of my grandma and hoped she would 20  know that I had been ashamed of her.
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A.funnyB.commonC.terribleD.clear
小题2:
A.admitB.receive   C.refuseD.show
小题3:
A.quarrel   B.accidentC.trouble   D.adventure
小题4:
A.already   B.alwaysC.simplyD.hardly
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A.enjoyingB.pretendingC.imaginingD.continuing
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A.warnB.demandC.advise   D.beg
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A.mindB.hearC.seeD.fall
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A.expectedB.declaredC.realizedD.doubted
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A.Because ofB.Except for  C.Such asD.Instead of
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A.died     B.cheeredC.disappearedD.suffered
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A.meetB.avoidC.arrangeD.hide
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A.changedB.finishedC.stoppedD.Prepared
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A.interviewB.report    C.tellD.write
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A.and then   B.even if   C.so thatD.as if
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