Eachquestioninthisbookhasacorrespondinganswer，areferencetoatextthatprovidesbackgroundfortheanswer，andashortdiscussionofvarionsissuesraisedbythequestionanditsanswer.Alistingofreferencesfortheentirebookfollowsthelastchapter.Formultiple-choicequestions，theonebestresponsetoeachquestionshouldbeselected.Formatchingsets，agroupofquestionswillbeprecededbyalistofletteredoptions.Foreachquestioninthematchingset，selectoneletteredoptionthatismostcloselyassociatedwiththequestion.