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．products should be made with less cost but higher efficiency B．products should be sold at low prices in large quantity C．products should be sold at high prices in large quantity D．standards must be established in his plants
A．his common sense B．his sense of humour C．his sight D．his sixth sense