It can be inferred that people living in the building where Charlie worked were______.

A．An airliner travelling from London to New York may take from S to 15 hours to cross the Atlantic.
B．We are normally quite unconscious of the earth's rotation on its axis.
C．The space capsule must be hurled through the atmosphere to reach its final speed of 18,000 mph.
D．An airliner can cruise at the speed of 400 mp

A．Physiological problems of space flight.
B．Speed and gravity of space flight.
C．Gravity and acceleration of space flight.
D．Acceleration and deceleration of space flight.