单项选择题
Most Computer operating systems in use today, including all consumer-targeted systems, include a TCP/IP（）.
A.plan B.requirement C.implementation D.design
Today there are （）computers in our homes and offices th...
Today there are （）computers in our homes and offices than there are people who live and work in them.
A.less B.more C.little D.lotsof
Very long, complex expressions in program are difficult...
Very long, complex expressions in program are difficult to write correctly and difficult to（）.
A.defend B.detect C.default D.debug
