Social security generally refers to all measures established by the U. S. legislation to maintain individual or family income at certain levels， to assure income if employment is lost， and to provide a great number of benefits covered by other programs.

Social security generally refers to all measures established by the U. S. legislation to maintain individual or family income at certain levels， to assure income if employment is lost， and to provide a great number of benefits covered by other programs.

A、正确

B、错误

正确答案：A

答案解析：社会保障（Social security）在美国，通常涵盖了一系列由立法确立的措施。这些措施旨在通过多种方式保障个人和家庭的经济稳定。维持个人或家庭收入在一定水平，可确保人们在面临诸如失业等困境时仍有经济来源以维持生活。同时，它还包括众多其他项目所提供的福利，如医疗保险、失业保险、养老金等各类福利项目，以应对不同的生活状况和风险。所以题中对社会保障的描述准确，该表述正确。