If one is looked at by a stranger for too long, he tends to feel ______.

A．was accepted by most bosses as a compromise
B．marked a turning point in the workers' struggle for more rights
C．indicated the improvement of the workers' welfare
D．signaled the end of "wage slavery"

A．to look into another passenger's eyes
B．to avoid eye contact with other passengers
C．to signal you are not a threat to anyone
D．to keep a distance from other passengers