单项选择题

According to the author, a born naturalist should first of all be （）

A．full of ambition
B．knowledgeable
C．full of enthusiasm
D．self-disciplined

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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．lacks some of the qualities required of a scientist
C．just reads about other people's observations and discoveries
D．comes up with solutions in a most natural way

单项选择题

30（）

A．Whatever
B．Whichever
C．Wherever
D．Whoever