The world’s urban population, increasing at four times the rate of rural populations, will double in the period 1990 - 2025. The world’s urban population, ____ ____ ____at four times the rate of rural populations, will double in the period 1990 - 2025.

The world’s urban population, increasing at four times the rate of rural populations, will double in the period 1990 - 2025.

The world’s urban population, ____ ____ ____at four times the rate of rural populations, will double in the period 1990 - 2025.

出自：国家开放大学-开放英语4

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