题目

七选五（共5小题；每小题2分，共10分） 根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 The band that wasn’t Have you ever wanted to be part of a band as a famous singer or musician? Have you ever dreamed of playing in front of thousands of people at a concert, at which everyone is clapping and appreciating your music? Do you sing karaoke and pretend you are a famous singer like Song Zuying or Liu Huan? To be honest, a lot of people attach great importance to becoming rich and famous.      1 关于电源电动势的说法，正确的是（　　）A．在某电池的电路中每通过2C的电荷量，电池提供的电能是4J，那么这个电池的电动势是0.5VB．电源的路端电压增大时，其电源电动势一定也增大C．无论内电压和外电压如何变化，其电源电动势一定不变D．电源的电动势越大，电源所能提供的电能就越多