Farmers often employ fertilizer or other special chemicals to _____the growth of crops, as is well-known.

  A. accelerate     B. advance    C. quicken   D. promote

A


解析:

句意: 農民經(jīng)常使用化肥或化學物質來促進莊稼的生長。根據(jù)句意，化肥能提到莊稼的生長速度，則有“動作加快；速度提高；促進生長”之意，符合題意。advance指使進步，發(fā)展；前進（to go or move something forward, or to develop or improve something）；quicken 指加快速度、速率等promote多指促進發(fā)展、貿易、繁榮、諒解或增進友誼等。

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