阅读理解 In 1917 , Russia was in chaos. The economy was collapsing, there were food shortages and the country was suffering heavy losses in the World War I . Inevitably, people began to lose faith in their ruler, Tsar Nicholas II. On 15 March 1917, after much political unrest, the Tsar decided to abdicate. He was replaced by a new government led by Alexander Kerensky.
To begin with a rival political group, the Bolsheviks, led by Vladimir Lennin and Leon Trotsky, supported the new government, but their relationship soon collapsed. The Bolsheviks wanted even more change - their aim was to replace the existing political structure with groups representing each sector of society and they urged every worker to join a revolution in order to bring this about. In July 1917, the Bolsheviks tried to overthrow the government but failed. They tried again on 24 October and this time they were successful. The provisional government was arrested in St Petersburg, and Lenin took over as Head of State. Support for the Bolsheviks soon spread across Russia, and world's first "workers' revolutionary State" became reality.