【单选题】________ excited Geoff Marcy most was whether there were planets in other solar system where life might exist.
【单选题】Dr. Marcy thinks that life may exist in the 55 Cancri system because ______.
A.
he has found the system similar to the solar system
B.
he has discovered an Earth-like planet there
C.
he has discovered a rocky planet there
D.
he has found signs of life in the system
【单选题】________ excited Geoff Marcy most was ________ there were planets in other solar system where life might exist.
【单选题】The computer doesn't ________ until it is connected to other parts of the system. [ ]
【单选题】There may be, somewhere outside the solar system, intelligent life ______ messages to us.