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1. Food prices are climbing around the world because farmers can't ____ demand for grain．

答案B
catch up with赶上；keep up with跟上；grow out of 出自于；put up with容忍。句子意思是“食品价格在全世界都在上升，因为农民跟不上对谷物的需求。”

2. A serious threat to farmers in many parts of the world is erosion是什么意思

对全世界农民来说的严重威胁是土地侵蚀

3. His dream is to circulate knowledge to farmers around the world.用to circulate的原因

动词不定式作表语。因前面主语没有do的形式，to不能省。