The study of natural history is not something to be left to biologists. In fact, their capacity _____ the time they can spend away from their offices is very limited.

A．in search of

B．in face of

C．in favour of

D．in terms of

宗法制的核心内容是嫡长子继承制，即“立嫡以长不以贤，立子以贵不以长”。下列分析正确的是（）①保障各级贵族在政治上的垄断和特权地位②防止贵族之间因权位和财产继承问题发生纷争③保证了统治者的德才素质④有利于统治集团内部的稳定和团结

A.①②③④

B.①②③

C.②③④

D.①②④