单项选择题
A. he was too young when he lived with them B. he was fully occupied with observing nature. C. he didn’t live very long with them D. the family was extremely large
A. most people on the sidewalk were on the same side as himself B. no one suddenly turned into a doorway C. a man was looking into the windows of a store D. no one wiped his face with a handkerchief
A. was born to a naturalist’s family B. didn’t like his brothers and sisters C. lost his hearing when he was a child D. was interested in flowers and insects in his childhood