Farmers often employ fertilizer or other special chemicals to the growth of crops, as is w

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(答案→)A. accelerate
B. advance
C. quicken
D. promote
解析：句意: 农民经常使用化肥或化学物质来促进庄稼的生长。根据句意，化肥能提到庄稼的生长速度，则有“动作加快；速度提高；促进生长”之意，符合题意。advance指使进步，发展；前进（to go or move something forward, or to develop or improve something）；quicken 指加快速度、速率等promote多指促进发展、贸易、繁荣、谅解或增进友谊等。