The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1 : There is no reason for the terror which the sight of a snake causes in most people.
S6 : Being aggressive by nature, they can attack human beings for no reason at all, taking a fisherman or swimmer by surprise in the water, where the man is somewhat helpless.
P : Of the poisonous snakes, only those found in the sea are always dangerous.
Q : They are only too anxious to avoid human beings.
R : Many more people are killed, much more frequently, by motor-cycles and cigarettes than by snakes.
S : The majority of snakes are harmless.
Select the correct sequence.