25% of doctors working in the US received their training elsewhere.That is close to 200，000 doctors educated abroad.Around 5，000 were trained in Africa，mainly Ghana，Nigeria and South Africa，but also elsewhere.In 2002，there were 47 Liberian－trained doctors working in the UStries，especially in the developing world，doctors are trained at public expense.If a doctor from Ghana is taken to the US，not only does that country lose its doctor，it loses the money paid for the training.That means the world's poorest people are paying for the health care of the world's richest people.

　　Why can't the US supply its own needs？After all0，000 of debt.Unlike lawyers and bankers，of which there are no American shortages，doctors lack the opportunities to earn huge salaries immediately and pay it all back.

　　Also，there is no central government planning for university education in America making it more difficult to create new medical colleges.

　　So while we look with envy at the wealth and achievements of the top American universities，we should bear in mind that not all is as well as it seems.In fact，it may be that the weakness of the US higher education system is contributing to the health and development crisis in some of the world's poorest regions.

　　1．What is the passage mainly about?

　　A．The high standards of universities in the United States.

　　B．The quality of doctors produced by American universities.

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