Although the bulk of industry resources and energies have focused on developing the fastest (1) or slickest (2) more and more mindshare is turning to the evolution of the computer interface. Advancements in the areas of input devices, (3) processing and vitual reality could lead to fundamental changes in the way human and computer interact. The technological battlefield of the future will be adding layers between the user and the raw machine to make the (4) as invisible as possible. (5) represents the next evolutionary step for the interface.
1（）
A．microprocessor
B．format
C．structure
D．procedure
AB的长为半径画弧，两弧相交于点M，N，作直线MN，交BC于点D，连接AD．若△ADC的周长为10，AB=7，则△ABC的周长为（ ）