A strong earthquake in the northeastern part of Japan has _______ a wave of sympathy from around the world. Relief supplies are constantly pouring into the stricken area every day.[ ]

A. set out

B. set up

C. set off  

D. set down

中国古代建筑的木构架结构——即采用（）、（）构成房屋的框架，屋顶与房檐的重量通过梁架传递到立柱上，墙壁只起（）的作用，而不是承担房屋重量的结构部分。