— It’s getting dark, but Mr. Chen is till at his office.

— No surprise. Who else can _______ he does.

A．do less work than

B．work as hardly as

C．work as hard as

D．be working hardly like

在甲醇热再生塔加热蒸汽量不变的情况下系统压力升高会导致温度（）。

A.升高

B.降低

C.先升后降

D.无变化