题干

小明学习了汽化和液化后,对书本练习的第3题感到疑问,于是他回家动手实验,发现水烧开了可纸杯却没有烧着.关于纸杯没有烧着,以下解释正确的是()

A:水的沸点高于火焰温度

B:水的沸点低于纸的着火点

C:纸的着火点高于火焰温度

D:纸的着火点低于水的沸点

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答案(点此获取答案解析)

B

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    Last week Lu visited England. He stayed with my grandmother. He said it was a strange visit. “I don't understand, but I1your grandmother a lot. When I arrived, I gave her a 2from Suzhou. She looked in it and asked me to take it back. Then I saw a red spider(蜘蛛) on the table so I killed it for her and she seemed very 3. Do English people like spiders?”
    “Later we went shopping. Someone was painting a shop 4, so there was a ladder. Grandmother5me walking under it and said I must walk around it. I liked the shops and bought a smart 6for my father and some new shoes for myself. When we got back, I put the shoes on the table and opened the umbrella to wonder 7it was all right. Your grandmother came in and 8!”
    “Then I broke a small 9 in the bathroom. Your grandmother’s face went white. I felt very sorry. When I left I gave 10grandmother some flowers. She counted and there were 13. She 11it. I think she was happy I was going.”
    I 12to Lu, “My grandmother follows the old customs(习俗). You must not give someone an empty purse 13they will have no money. You must not kill a “money spider”or the same will happen. It is very unlucky to walk under a ladder and to put new shoes on the table. A(n)14umbrella in a house means someone will die. Breaking a mirror brings seven years’ bad luck, and 13 is 15a very unlucky number. You were really making my grandmother very afraid. ”