In China, the Midautumn Festival is a good chance for family gettogether under the full moon,

a ________ for happiness and prosperity.[ ]

A．signal  

B．celebration

C．feature  

D．symbol

迄今发现年代最早、结构最典型的水井遗址是后岗二期文化的（）遗址。

A.半坡遗址

B.磁山遗址

C.白营遗址

D.半山遗址