【听力】6-7
Jerome
录音：http://pan.baidu.com/s/1pJBH4ld Answer the following questions: 1. When does the speaker say we will reach peak world population? 2. What number does he give for the current world population? 3. What does he say about organic farming? 4. What other solution does he suggest? 5. Which three cereal crops does he say are the most important?
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