单项选择题

What does the word "advanced" (Sentence 2, Para.4) refer to

A．Improved.
B．Progressed.
C．Getting old.
D．Complex.
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单项选择题
About the memory in comparison with the computer the writer says that ______.
A．neither of them is completely reliable all the time
B．the memory is more complicated than the computer
C．the computer operates in a more organized way than the memory
D．neither of them is used to its fullest capacity all the time
单项选择题
What does the word well-trodden (Sentence 7, Para. 2) mean
A．Repeatedly "walked upon".
B．Well-thought.
C．Well-performed.
D．Carefully prepared.
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