[音频]2. When does the woman want the man to come?
At 7:00
B. At 7:30
C. At 6;00
D. At 6:30
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[音频]3. Where are they going?
A. To school.
B.To the cinema.
C.To a shop
D.To a restaurant
[音频]4. How much does one sweater cost?
A. Twentydollars
B.Forty dollars
C.Twenty-five dollars
D.Fifty dollars
[音频]5. Where did this conversation most likely take place?
A. In a laundry.
B. In a library.
C. In an elevator.
D. In a bakery.
一分子结晶水柠檬酸主要用作清凉饮料、果汁、果酱、水果糖和罐头等食品工业中,其主要主要作用为：
A. 酸性调味剂
B. 防腐剂
C. 抗氧化剂
D. 增强食欲和促进体内钙、磷物质的消化吸收
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