单项选择题

According to the passage, which of the following is NOT a factor in the complete understanding of price

A．The quality of a product.
B．Warranties that cover a product.
C．The quantity of a product.
D．Instructions that come with a product.
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单项选择题
According to the author, a born naturalist should first of all be ______.
A．full of ambition
B．self-disciplined
C．full of enthusiasm
D．knowledgeable
单项选择题
The author says that he is a naturalist rather than a scientist probably because he thinks he ______.
A．has a great deal of trouble doing mental arithmetic
B．comes up with solutions in a most natural way
C．lacks some of the qualities required of a scientist
D．just reads about other people’s observations and discoveries
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