(2013·大连24中模拟)Good health is the basis for students to ________ carry on with their studies and to do any other activity.

A．especially

B．dependently

C．effectively

D．reasonably

今天仍然遗存下来的南京城墙是明代南京都城的( )城墙。

A．宫城
B．皇城
C．京城
D．外郭