The visitors are very ______ to see so many changes _______ in Shenzhen since 1979.

A．surprise; have been taken place

B．surprising, took place

C．surprised, have been taken place

D．surprised, have taken place

对于经济生活方式，商朝人主要以农业为生产生活方式，这种生活方式较为典型地表现在下列哪个时期：（）

A、商汤时期

B、盘庚迁殷之后

C、武丁时期

D、商纣时期