单项选择题
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．through great social revolution B．through automotive technological revolution C．through numerous mechanical inventions D．through radical political reforms
A．the human brain B．glands and systems in the body C．the cortex of the adrenal gland D．the medulla of the adrenal gland