A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ________ many factors lead to the change.

A．which

B．what

C．where

D．that

乳腺癌放射治疗的靶区包括（）.

A.乳腺

B.胸壁

C.腋窝

D.锁骨上及内乳淋巴结

E.颈部淋巴结