问题
单项选择题
以下关于减压浓缩的叙述，不正确的是（）
A.能防止或减少热敏性物质的分解
B.增大了传热温度差，蒸发效率高
C.不断排出溶剂蒸汽，有利于蒸发顺利进行
D.沸点降低，可利用低压蒸汽作加热源
E.不利于乙醇提取液的乙醇回收
答案
参考答案：E
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以下关于减压浓缩的叙述，不正确的是（）
A.能防止或减少热敏性物质的分解
B.增大了传热温度差，蒸发效率高
C.不断排出溶剂蒸汽，有利于蒸发顺利进行
D.沸点降低，可利用低压蒸汽作加热源
E.不利于乙醇提取液的乙醇回收
参考答案：E
It was the beginning of a new term. As a(n) 36 teacher in that school, I didn’t know any of the students. A little girl was 37 at the gate of the class  room. She looked very 38 .I walked up to her and asked 39 she stood there. But she said 40 . Instead, a boy shouted, “She is from Grade Four, the 41 student in her grade.” I looked at the little girl, who didn’t seem to be the smart kind. I 42 why her teacher asked her to stay in Grade Three. I took her hand and 43 her into the classroom. “Sit here. Now you are my student and I’m your teacher,” I said. She 44 said nothing, but she burst into tears. I later learnt that her parents 45 in a car accident, and she had 46 talking to others since then. She learnt very 47 . I gave her respect and never 48 her as I know everybody deserves (值得) respect. I 49 her after school, and she was making 50 little by little. I encouraged her and as 51 went by, she was not as shy as before. At the end of the term, she seemed to have forgotten all her 52 . She was not one of the best students when she left that school, 53 at least, she was not that shy and sad little girl any longer. In the following 54 , she would send me a card on each Thanksgiving Day. Three days ago, I received a(n) 55 to her wedding. And now, I am at her wedding, and she is smiling brightly. Everyone deserves respect and everyone can be happy!
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