- 问题详情:DeputyAgricultureSecretaryKathleenMerriganseesanepidemic(流行病)sweepingacrossAmerica'sfarmland.Ithaslittletodowiththeusualchallenges,suchasflood,risingfuelpricesandcrop-eatinginsects.Thecountry'sfarmersaregettingolder,andtherearefewerpeopl...
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