Pickpockets operate in crowded places in the hope of getting easy pickings. Don't make it
Please co operate with the police by reporting any crime or suspicious activity immediately, either by dialling 110 or calling at your nearest police station.
The main purpose of the passage is to______.
A.warn people of pickpockets.
B.tell people what to wear.
C.describe how to catch thieves.
D.explain how to contact the police.