A—milestone
B--traffic light
C--traffic post
D--single line
E--safety island
F--parking place
G--caution pedestrian crossing
H--narrow bridge ahead
I--7public car only
J--two-way traffic
K--steep hill
L--rough road
M--excessive speed
N--zebra stripes
O--traffic jam
P--no turns
( )超速 ( )禁止掉头

A. People have different stress at work.
B. Stress always does harm to our work and health.
C. There has been a rise in stress at the workplace.
D. Sometimes stress cannot be completely prevented but it can be controlled.