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Quiz. Lawrence: You all have been working very hard lately. You’ve created enough excitement at our booth and brought energy to the show. I want to say our _____ at the trade show was a success. What are your impressions? Maria:The show was really fantastic! It almost gave me the illusion that the financial crisis never happened. (Unit02 Episode1)

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Quiz. Angela: Maria, will you please pass to Lawrence the trade show report? Lawrence: Thank you. Very good! It seems the product demonstration has _____ our brand. (Unit02 Episode1)

纯液体当温度升高时液体的表面张力如何变化?()

A. 升高
B. 降低
C. 不变
D. 无法确定

表面活性物质加入水中后,水溶液的表面张力()

A. 增大
B. 减小
C. 不变
D. 先增大后减小

从热力学的角度来看,农村挖土松地的主要目的是()

A. 保水
B. 除草
C. 松土
D. 治虫