22.a quantity of与quantities of的主谓一致

a(large/great/small)quantity of后跟不可数名词时，谓语动词用单数;后跟可数名词复数时，用单复数都可以。(great)quantities of不论跟可数名词还是不可数名词，谓语动词都是用复数。下面这些例句均来自BNC。

A small quantity of liquid then changes into a large quantity of steam．(BNC)

少量的液体于是就变成了大量的气体。

A large quantity of arms of American manufacture were captured．(BNC)

缴获了大量美国制造的武器。

Great quantities of loot were shipped back to England．(BNC)

大量的掠夺物用船运回到了英国。

Harmful quantities of radiation are also released both before and after the uranium fuel enters the power station．(BNC)

大量有害辐射在铀燃料进入核电站前后也会被释放掉。

提示：

loot(赃物、抢来的东西)，radiation(辐射)，均为不可数名词。