Section B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice. Today I've returned to Chicago to discuss another issue relating to our security, and that's the need for us to improve the health security of American citizens. And for the sake of health care for all Americans, we must reform. the medical liability system. For years, leaders of both political parties have talked about these reforms. Now is the time to get the job done. We have just had a discussion with fellow citizens--some doctors and other professionals on medical care. I want to thank them for joining me today and sharing their stories and their concerns about the future of health care in our country. One thing is for certain about health care in our country, that is, we've got the best health care system in the world, and we need to keep it that way. We've got great doctors in America. We're really good at research. We're developing technologies and medicines which are extending lives not only in our country, but also across the world. To make sure we've got a good health care system today and tomorrow, we've got to make sure that no policy of the federal government will undermine (损坏) the system of private care in America. As folks who deliver that care, you know that we've got challenges in our system. We must address the challenges while not undermining the strengths of American medicine. We have got a problem in America that we must deal with. Medical liability is not only a local problem, but a national issue that requires a national solution. There are challenges in the health care system. We understand that in Washington. And we can answer those challenges with practical, sensible, compassionate (有同情心的) reforms. That is the charge before us, and that is the charge we must keep on behalf of the American people. What is the problem being talked about for years in America?