The other four countries provide better health care than the U. S.A．RightB．WrongC．Not ment
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正确答案：B
解析：问题句把研究中的5个国家在健康保健方面的工作效果进行了比较，因此注意文章中进行比较的句子。文中出现The United States may spend twice as much on healthcare as other rich countries but it is not getting results to match, according to studies released onTuesday. But in the study of five wealthy countries, published in the journal Health Affairs，researchers found no single nation had clearly the worst or best health care system. 以上句子的内容是说“这5个国家没有谁在健康保健方面最好或最坏”，而问题句说“其余四个国家都比美国好”，很显然这个推断是与原文内容不一致的，因此判断问题句的说法不正确。