下列哪一项准确定义了安全基线（）？
A、指明应该做什么和不应该做什么的规定B
暂无解析
ThefollowingwordsofthebasicwordstockdenotethemostcommonthingsandphenomenaoftheworldaroundusEXCEPT______.
AllplaysarealiketomejustasallmusicisaliketoTony.（）
Perseveranceisakindofqualityandthatis_______ittakestodoanythingwell.
Attheageofeighty-seven,()readhispoetryattheinaugurationofPresidentJohnin1961.
Inthe1960spopmusicunderwentarevolutionwhen________becameworldfamousandturnedtheirhometownofLiverpoolintoaplaceofpilgrimage.
