单项选择题
A.the designed area
B.the designated area
C.the indicated area
D.all area over the world
单项选择题 Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.
单项选择题 LOW AT 34N 135E ESLY SLWLY INTST NC．This description is most likely to be under the heading of（）.
单项选择题 LOW ABOUT 300 MILES SOUTHWEST OF LISBON 1004 MOVING SLWLY SOUTHEAST COMMA FILLING 1006 BY MIDNIGHT.This phrase is likely to be under the heading of（）.