题目

The boy doesn’t speak ____ his sister, but his writing is good.         A.    as well as              B. as good as           C. more better than       D. as better as 答案：A收音机上调节音量的旋钮实际上是一个旋钮型变阻器如图所示，若接线片A、B已接入了电路，则顺时针转动旋钮触片时，收音机的音量将________．（选填：“不变”、“变大”或“变小”）