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
单项选择题 The author says that he is a naturalist rather than a scientist probably because he thinks he （）
单项选择题 The first paragraph tells us the author （）
单项选择题 30（）
