The study shows that the total number and area of the Jianghan lake group have decreased greatly due to reclamation and cultivation, and the lakes remained are being transformed into marsh.

研究结果表明，江汉湖群个数、面积已锐减，现存湖也正向沼泽方向演化。

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C. With a relatively stable cultivation area, China can achieve its desired total grain output target if the annual average increase rate of per unit yield is 1%.

在播种面积相对稳定的前提下，只要粮食单产年平均递增1%，就可以达到预期的粮食总产量目标。

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