. (2) A. Before World War I, the contradiction between Britain and Germany was the main contradiction between imperialism. In order to defeat Germany, Britain abandoned the policy of "glorious isolation", coordinated the conflict of interests with France and Russia, and sought an alliance with France and Russia; B. At the beginning of World War I, in order to strangle the newborn Soviet Russia, Britain tried to use Germany to contain the Soviet Russia; After the outbreak of World War II, Britain and Germany became belligerent rivals again. Churchill believed that only a unified Soviet Union could defeat German fascism. (3) In the material 1, Russia is called "the devil king" because Russia has always pursued the policy of aggression and expansion, and it is an important competitor of Britain when it competes for the Balkans, the Middle East and the Far East; The reason why the Soviet Union is called "the devil" in Material 3 is that the Soviet Union is a socialist country, which is essentially different from the British social system. (4) The adjustment of foreign policy has always turned to Britain's national interests.