A．Modem people experience more stress than the cave man． 
B．The cave man experienced more stress than modem people． 
C．People don’t suffer more stress today；it’s just that they think they do． 
D．Modem people have the same worries as the cave mall did．

A．Your favorite football team has lost an important game． 
B．You have failed all important examination． 
C．You are informed of an accident of your best friend． 
D．You have won the first prize in all English competition．