单项选择题
A．a scientist as well as a naturalist B．a naturalist but not a scientist C．no more than a born naturalist D．first of all a scientist
A．full of ambition B．knowledgeable C．full of enthusiasm D．self-disciplined
A．was interested in flowers and insects in his childhood B．lost his hearing when he was a child C．didn't like his brothers and sisters D．was born to a naturalist's family