Apart from technological development, the 20th century ____ an enormous worldwide political, economic and cultural transformation（）
A. witnessed
B. witness
C. witnessing
D. has witnessed
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What does computer program mean（）
A. Command sequence to achieve a given task
B. Collection of all commands of a computer
Commands that the computer can recognize and execute
D. High-level programming language statements
What code is used for signed real numbers’ representation in modern computers（）
A. Fixed-point integer
B. Fixed-point decimal
C. Floating point numbers
D. ASCII
Which component in the computer is used to pre-store instruction and data in order to make the program run automatically（）
A. CPU
B. Memory
C. IO interface
D. IO device
What does computer instructions refer to（）
A sequence of commands to achieve a given task
B. Collection of all commands of a computer
Commands that the computer can recognize and execute
D. High-level programming language statements
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