单项选择题

In the text, "it's a chance in a million." (Line 2, Para. 1) means that ______.

A．it is common
B．it's extremely unusual
C．it's lucky
D．it's impossible
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单项选择题
What does the text mainly discuss
A．Importance of knowledge.
B．Differences between knowledge and practice.
C．How to gain experience.
D．Book knowledge and kractical experience.
单项选择题
According to the writer, knowledge gained from practical experience is ______.
A．as important as that from books
B．less important than that from books
C．more important than that from books
D．too limited to Use
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