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
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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
单项选择题
is the last sentence, the word they refers to ______.
A．cash and credits
B．buyers and sellers
C．return privileges
D．all the factors
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