预防高血压应该从什么时候开始（） ["幼年","青年","中年","老年"]
When out of sight of land, a ship’s position can be found by using（）. ["the coastal navigation","the celestial navigation","traditional navigation","the great circle navigatio"]
（）年，国家税务总局制定下发了《纳税信用管理办法（试行）》（国家税务总局公告2014年第40号）。 ["1984","1994","2004","2014"]
才从塞北踏冰雪，又向江南看春花从塞北到江南地域分异形成的最主要因素是（） ["水分","热量","土壤","地形"]
早在（）年上海街头就已出现了别克的身影。 ["1909","1903","1912","1906"]
材料的密度是指什么？
