一、单选题（共 20 道试题，共 80 分。）V
1. A ( ) is the primary input device. It is used for entering letters, numbers and commands into the system.
A. RAM
B. keyboard
C. output devices
D. memory
满分：4 分
2. ( ) performs arithmetic, comparison, and logic operations. It is one part of the CPU.
A. RAM
B. ROM
C. CPU
D. ALU
满分：4 分
3. The two components of the CPU are connected by a kind of electronic roadway called a(an) ( ).
A. USB
B. bus
C. port
D. keyboard
满分：4 分
4. ( ) is the electronic device that interprets and carries out the basic instructions that operate the computer.
A. Processor
B. hardware
C. memory
D. CPU
满分：4 分
5. ( ) refers to the physical equipment that can perform the basic functions contained within the data processing cycle.
A. Software
B. Hardware
C. Memory