单项选择题

One characteristic of the rich classes of a declining society is their tendency to______

A．take in the recently wealthy
B．retreat within themselves.
C．produce publications on manners.
D．change the laws of etiquette,
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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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