阅读理解。 People often say that money talks.They mean that a person with a lot of money can say how he or she wants things done.But it is not easy to earn enough money to gain this kind of power. Anyone in a business will tell you that it is a jungle (丛林) out there.This expression is probably used because the jungle is filled with wild animals and unknown dangers.Sometimes people in business feel competing businesses are as dangerous as wild animals. People in business have to be careful if they are to survive the jungle out there.They must not be led into making bogus investments (投资)．The word bogus began to appear in American newspapers in the 1800s.A newspaper in Boston,Massachusetts said the word came from a criminal (罪犯) whose name was Borghese.Borghese wrote checks to people although he did not have enough money in the bank.After writing the checks,he would flee from the town.So, people who were paid with his checks received nothing.The newspaper said Americans shortened and changed his  name Borghese to bogus. People trying to earn money also must be aware of being ripped off.A person who is ripped off has had something stolen,or at least has been treated very unfairly.A writer for the magazine American Speech said he first saw the expression used on a sign t hat a student carried in a university.The message on the sign was that the student felt ripped off,or cheated.Perhaps the best way to prevent getting ripped off in business is not to try to get rich quickly. 1.This passage is mainly written to________. A．explain several expressions related to money B．tell us some skills of learning English words C．tell us the secret of how to do business D．tell us the power of money 2.People compare doing business to being in a jungle because________. A．doing business is as exciting as living in a jungle B．businessmen are as dangerous as animals in a jungle C．doing business is as difficult as living in a jungle D．businessmen are as careful as people living in a jungle 3．If we say something is bogus,we probably mean it is not________. A．real B．beautiful C．good D．new 4．According to Paragraph 2,where did the word ' bogus ' come from? A．The name of a very successful businessman. B．The name of a criminal who cheated others. C．The name of a famous newspaper in Boston. D．The name of a check written by a criminal. 5．If you have been ripped off,it probably means________. A．you have been treated well B．you have earned much money C．you have had something stolen D．you have left something somewhere