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

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

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

A．made up of
B．consist of
C．make up of
D．compose of