题目

目前，江南丘陵地区发展农业的重要措施有 ①大力改良红壤 ②扩大棉花种植南积 ③应用大型农业机械 ④封山育林保持水土 A.①②        B.①④        C.②③        D.③④   答案：B Lee _______ his mobile phone at home just now.A.leave B.leaves C.leaved D.left