问题
单项选择题
The major goal of USB was to define an external expansion bus which makes adding (70) to a PC as easy as hooking up a telephone to a wall-jack. USB 2.0 is an evolution of the USB 1.1 (71) , providing a higher performance interface.
A.peripherals
B.outside
C.inside
D.beside
答案
参考答案:A
解析:Peripherals意为“外围设备”。