党的基本路线的实质是（）
A. 以经济建设为中心
B. 坚持改革开放
C. 坚持两手抓、两手都要硬的方针
D. 坚持四项基本原则
“三个代表”思想的基础是（）
A. 坚持发展先进生产力
B. 坚持代表先进文化的前进方向
C. 坚持代表最广大人民群众的根本利益
D. 坚持以经济建设为中心
People in Edinburgh began to ignore Burns when he went there the next winter because ______.
A. his trips there were too frequent
B. their interest in his poems began to decrease
C. they disapproved of his habits
D. they could not catch up with his fast-paced life style
中性点接地的供电系统接线方法：所有用电设备的金属外壳与系统的( )可靠连接。
A. 零线
B. 地线
C. 零线或地线
D. 接地线
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