In the most common procedure for harvesting forage crops such as alfalfa, as much as 20 percent of the leaf and small-stem material, the most nutritious parts of the plant, shatters and falls to the ground. 在这个句子中谓语动词(shatters and falls )是单数形式,它的单复数形式是受such as后的名词(alfalfa)还是被举例名词(crops)决定呢? 这是不是可以用就近原则解释呢?? 鄙人不才,求NN解答!