A. full of ambition
B. self-disciplined
C. full of enthusiasm
D. knowledgeable
A. lost his hearing when he was a child
B. didn't like his brothers and sisters
C. was born to a naturalist's family
D. was interested in flowers and insects in his childhood
A. just reads about other people's observations and discoveries
B. comes up with solution in most natural ways
C. has a great deal of trouble doing mental arithmetic
D. lacks some of the qualities required of scientist
A. he didn't live very long with them
B. he was fully occupied with observing nature
C. the family was extremely large
D. he was too young when he lived with them