单项选择题

The author explains the difference between popular and learned words ______.

A．by contrast
B．by giving details
C．by a lot of examples
D．by making deductions
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单项选择题
In the author's opinion, there are ______ kinds of words that compose the whole vocabulary.
A．three
B．two
C．four
D．five
单项选择题
The main idea of the passage is that ______.
A．the two kinds of words, popular and learned words, are both important in a cultivated language
B．it is easy to learn popular words in a language
C．we must make great efforts to learn learned words
D．learned words are more important than popular words
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