题目

下图为我国某城市城区地租分布等值线图(数值：a>b>c)，读图完成题。  该市重工业不断向东北部迁移，主要原因可能是（   ）     ①城区地价上涨②为了缓解城区日益严重的环境污染③北部人口众多，有大量剩余劳动力  ④北部地区矿产资源丰富     A．①②    B．②③    C．①③   D．②④In ________ 1970s, the two countries were at ________ war, so his father gave up his study and joined the army．A.不填；不填B.the; theC.the; aD.the;不填