George：Excuse me，but how can I see a doctor
Security guard:______.

A．faster and lighter
B．more convenient and comfortable
C．bigger and lighter
D．quicker and larger

A．There will be no place the same as our Earth.
B．There will be many places, better than our Earth.
C．There will be some planets which may be suitable for our human being to live.
D．There will be a planet for man to be used as home in the near futur