正方体的棱长扩大到原来的3倍，它的表面积扩大到原来的______倍，体积扩大到原来的______倍．

A.3 B.6 C.9 D.27．

________ excited Geoff Marcy most was whether there were planets in other solar system where life might exist.   

A．It

B．That

C．What

D．Why