Business English I

There is an Intermediate-English version of Wikipedia which you can read without having to look up every word. 
You can select it as the Simple English language, or go to http://simple.wikipedia.org 

To improve your vocabulary and reading skills, go there and find information about some companies you find interesting. 
For example - http://simple.wikipedia.org/wiki/Apple_Inc. or http://simple.wikipedia.org/wiki/Google