Young people are under great pressure. Therefore, parents shouldn’t expect too much from them, for it will only cause pressure to ____________.

A．pick up

B．turn up

C．break up

D．build up

分馏法原油稳定装置如塔顶温度升高，塔顶产品中难挥发组分含量增加，产品质量（）。

A.下降

B.提高

C.不变

D.不稳定