Our son doesn’t know what to _____ at the university; he can’t make up his mind about his future.

A．take in

B．take up

C．take over

D．take after

对于蒸发量≥2t/h的蒸汽锅炉，除装设水位表外，还需装（）。

A.高低水位报警器；

B.低水位联锁保护装置；

C.超压报警装置；

D.超温报警装置。