Jobs are hard to get and, _____, more young people are continuing their education. [ ]

A. above all

B. as a result

C. after all

D. on the contrary

为了使构件系统更切合实际、更有效地被复用，构件应当具备______，以提高其通用性。

A．可继承性

B．可变性

C．可封装性

D．可伸缩性