Knowledge is a comfortable and necessary retreat and______for us in an advanced age; and if we do not plant it while young, it will give us no shade when we grow old. A．ingredient B．reliance C．shelter D．inclination
A. A．ingredient B．reliance C．shelter D．inclination
【参考答案】
C shelter“掩蔽处，躲避处”；ingredient“组成部分，成分”；reliance“依靠，依赖”；i......