题目

小科家客厅里的顶灯由两个节能灯构成，并由一个开关控制，一个灯坏了，另一个灯还能正常发光，则两个灯的电路图应该为（ ） A . B . C . 答案：AThe president _________ at the meeting, _________ by his secretary. A．turned up, being accompanied B．turned up, accompanied C．took up, being accompanied D．took up, accompanied