A) a sense C) particular
B) addition D) general

A．In addition
B．However
C．In contrast
D．Therefore

A．It helped the subjects to brake sooner at the red light.
B．It helped the drivers to respond faster to objects in their central field of vision.
C．It helped the subjects to respond faster to objects in their peripheral vision.
D．It can produce more positive results than negative results for drivers.