题目

Some people think that paper books ________ by E-books in the near future.A. replace B. is replaced C. will be replaced D. will replace 答案：【答案】C【解析】句意：有些人认为纸质书在不久的将来会被电子书取代。A. replace动词原形；B. is replaced一般过去时态的被动语态；C. will be replaced 一般将来时态的被动语态；D. will replace一般将来时的形式。根据空前paper books和by E-books in the near future.可知，此句是一般将来时态的被动语态，此空故填will 如图所示，电源由3节新干电池组成，L1、L2是相同的两个灯泡，则：（1）当S1打开，S2闭合时，电压表的示数为4.5V4.5V；（2）当S1闭合，S2打开时，电压表的示数又是2.25V2.25V．