听力原文:M: May I help you?
W: Yes, please. I need a small toothbrush.
M: Soft, medium, or hard? And what color would you like, yellow, red, or blue?
W: I prefer the red one. Medium, please.
M: Here you are. Is there anything else?
W: Yes. I need some toothpaste.
M: What brand do you like? Colgate or...
W: Please suggest a good one. I'm not familiar with American brands.
M: This is the kind I use. Do you want a large or a small tube?
W: How much is the large one?
M: $11.40.
W: I'll take it. How much do I owe you in all?
M: Toothbrush, 89 cents; toothpaste, $11.40. $12.29 altogether. Anything else?
W: Are the magazines around here?
M: No. They are on the first counter to the left.
W: Do you have Cars Magazine?
M: We are out of them right now. The next issue comes out tomorrow.
W: Do you have last month's issue of Reader's Digest?
M: I'm sorry. We've sold out. There's usually a copy at the library.
W: I have plenty of time. I'll go there now. Thank you.
(27)
A.Soft and yellow.
B.Hard and red.
C.Medium and blue.
D.Medium and red.
第1题
根据羟基蒽醌酸性不同进行分离的方法是
A.氧化铝柱色谱法
B.有机溶剂提取法
C.水蒸气蒸馏法
D.pH梯度萃取法
E.碱提酸沉法
第2题
根据羟基蒽醌酸性不同进行混合物分离的方法是
A.酸水提取法
B.碱水提取法
C.水蒸气蒸馏法
D.pH梯度萃取法
E.氧化铝柱色谱法
第3题
可用于提取具有游离酚羟基的蒽醌类化合物的方法是
A.酸水提取法
B.碱水提取法
C.水蒸气蒸馏法
D.pH梯度萃取法
E.氧化铝柱色谱法
第4题
可用于挥发性苯醌提取的方法是
A.有机溶剂提取法
B.酸提碱沉法
C.水蒸气蒸馏法
D.pH梯度萃取法
E.氧化铝柱色谱法
第5题
用于提取挥发性苯醌的方法是
A.氧化铝柱色谱法
B.有机溶剂提取法
C.水蒸气蒸馏法
D.pH梯度萃取法
E.碱提酸沉法
第9题
A、水蒸气蒸馏法
B、硅胶柱法
C、碱提酸沉法
D、AlO
E、pH梯度萃取法
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