单项选择题
A．The adrenal gland is located on top of the kidney. B．Each kidney is composed of two adrenal glands. C．The medulla is inside the cortex. D．The cortex and the medulla have different functions.
A．measures the movements of a spaceship by means of light beam B．makes use of microwaves C．makes use of sound waves D．Both A and B
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