单项选择题

The red, orange and yellow lights contain ______.

A．less heat than the other lights
B．more heat than the other lights
C．a great deal of heat
D．a little heat
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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
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.
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