问题
选择题
化学物质在生产、生活中有着广泛的应用。下列说法正确的是[ ]
A．可用聚氯乙烯塑料制品包装食品
B．农业上为提高粮食产量，应大量施用化肥、农药
C．为防止电池中的重金属等物质污染土壤和水体，应积极开发废电池的综合利用技术
D．打开碳酸饮料瓶，有大量气泡逸出，是因为压强减小，气体的溶解度增大
答案
答案：C
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化学物质在生产、生活中有着广泛的应用。下列说法正确的是[ ]
A．可用聚氯乙烯塑料制品包装食品
B．农业上为提高粮食产量，应大量施用化肥、农药
C．为防止电池中的重金属等物质污染土壤和水体，应积极开发废电池的综合利用技术
D．打开碳酸饮料瓶，有大量气泡逸出，是因为压强减小，气体的溶解度增大
答案：C
Tang Hai is chatting with his e-pal David on QQ (T: Tang Hai D: David) D: Hi. How is it going these days? T: Pretty good! We celebrated our Dragon Boat Festival(端午节) last week. D: Dragon Boat Festival? 小题1: T: To remember an ancient Chinese poet(诗人)。 D: How do you usually celebrate it? T: 小题2: But this year, we did something more interesting. D: What did you do? T: Our school had a Dragon Boat race. D: 小题3: who won the race? T: Our class. D: 小题4: T: Thanks a lot. I hope you can come to China sometime. D: 小题5: I’m interested in Chinese traditions. Tell me more about them next time. T: Ok, I will. See you. D: See you!
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