3. 答案

　　D

　　解析

　　推理判断题。作者在第三段中列举了世界上很多地方受气候变化的影响，经历了暖冬。故选D项。

　　4. 答案

　　B

　　解析

　　推理判断题。根据倒数第二段可知，北极的冰融化会减弱水流，使寒冷的北极空气进入中纬度地区，以至于影响世界上很多地方。故选B项。

　　The price of blueberries dropped sharply to as low as RMB 60 per kilogram recently at fruit stalls in China, giving blueberry lovers a hugely pleasant surprise. However, the low price has caused many farmers who joined the boom of planting the fruit several years to lose considerable profit.

　　Low prices for blueberries can be seen at many supermarkets of Guangzhou. In a supermarket at Zhongshan Road, a 125-gram pack of Qingdao-brand blueberry was being sold at RMB 8.8, compared to its highest price earlier this year of RMB 23.8, supermarket staff said.

　　Blueberries are loved by Chinese customers for their richness in minerals and vitamins. Planting blueberries was hot business 7 or 8 years ago when the blueberries in the Chinese market were mainly imported and its demand exceeded (超过) supply, according to Cui, purchasing manager of a supermarket chain. Encouraged by the profits, the total planting area skyrocketed from about 35, 000 mu (23.31 sq. kin)in 2011 to more than 100, 000 mu (66.67 sq. kin)today in Qingdao, East China抯 Shandong Province where gr ows most Chinese blueberries, as official figure indicates.

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