单项选择题

Which of the following is NOT an element of the code of etiquette

A．Respect for age.
B．Formal compliments.
C．Proper introductions at social functions.
D．Eating with a fork rather than fingers.
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单项选择题
The 3rd generation of programming language shares all the following characteristics EXCETP _____.
A．it is used in designing software.
B．it is hardware-independent.
C．is should be translated into the computer language by software.
D．it is designed to solve some specific problem.
单项选择题
In the late 1950’s, for the first time a computer programming language _____.
A．began using binary numbers
B．was used to implement the Unix operating system
C．was put into the market
D．was used for modeling physical and environmental events
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