题目:
阅读理解 | |||||
Bayfield Shopping Coupons (赠券)
1. What are these ads for? A. Food you can order for delivery. B. Places to go on vacation. C. Special offers at a shopping center. D. Things on sale in a big store. 2. Which of the following is true according to the ads? A. Spending $50 means 3 hours of free parking. B. One person can buy 4 tickets for the price of three. C. After buying two CDs, you can get another two CDs for free. D. At Mike's Cafe, people can get a free drink after spending $6. 3. Which of the following is NOT mentioned at this mall? A. Clothes store. B. Music store. C. Restaurant. D. Toy store. 4. We can know from this passage________. A. there is more than one theatre in the center B. if you buy a book there, you may pay less than half the price C. you may get a free one if you buy a shirt, or a tie, or a pair of shoes D. you won't get a free soft drink unless you spend more than 10 dollars on the meal |
答案:
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答案:C题目分析:在酯化反应中羧酸提供羟基,醇提供氢原子。所以若乙酸分子中的氧都是18O,乙醇分子中的氧都是16O,二者在浓H2SO4作用下发生酯化反应的化学方程式为:CH3C18O18OH+H16OCH2CH3CH3C18O16OCH2CH3+...