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

A．Recently, two American astronauts have landed on Mars.
B．The surface of Mars is very hot.
C．The journey to the moon started the future exploration in space.
D．There is life in Venus.

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