A ( ) is the primary input device. It is used for entering letters, numbers ...

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