填空题

Cotton farmers in the upper reaches of the Aral switched to rice growing in order to gain higher yields.

【参考答案】

N

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填空题

The author presents both a bleak and an encouraging picture of the environmental conditions worldwide.

问答题

你以顾客的身份给一定超市的经理写一封投诉信。投诉信应包括以下要点：投诉原因2. 你的要求