pH＝2的两种一元酸x和y，体积均为100 mL，稀释过程中pH与溶液体积的关系如图所示．分别滴加NaOH溶液(c＝0.1 mol/L)至pH＝7，消耗NaOH溶液的体积为Vx、Vy，则

A．x为弱酸，Vx<Vy

B．x为强酸，Vx>Vy

C．y为弱酸，Vx<Vy

D．y为强酸，Vx>Vy

The students always have ______ to do.

A．much homeworks

B．many homeworks

C．many homework

D．much homework