—Look, those great notebooks are __________in our school store. Let’s have a look.

—OK. Anybody can __________ the prices.

A．sell, buy

B．sell, afford

C．on sale, afford

D．on sale, sell

废水是指经过工艺过程使用后排放的活工艺过程产生出来的水，这种水对该工艺过程而言已无进一步直接利用的价值。