【quantity】quantity后名词,动词单复数由决定?

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【答案】 应该看情况而定：
　　首先要分清：a large quantity of 或：quantities of 表示“大量的……”,而the quantity of 表示“……的数量”
　　1.若是“a large quantity of +复数名词”,则谓语动词用复数,若是“a large quantity of +不可数名词”,则谓语动词用单数.
　　如：A large quantity of bananas are on the table.
　　A large quantity of beer is sold.
　　2.若是“quantities of +复数/不可数名词（表示“大量的”）”,则谓语动词一律用复数.
　　如：
　　Quantities of nuts are on the ground.
　　Large quantities of wheat are being sent abroad.
　　3.若是“the quantity of （表示“……的数量”）+复数/不可数名词”,则谓语动词一律用单数.
　　如：
　　The quantity of books is 5000.
　　The quantity of heat has increased.