单项选择题
A．today’s B．yesterday’s C．tomorrow’s D．poor
A．help to keep your energy for the day’s work B．help you to control your temper early in the day C．enable you to concentrate on your routine work D．keep your energy cycle under control all day
A．are not found; large parts of the land is covered with snow B．are not found; it is at the northern top of America C．are found ; it is on the Pacific "ring of fire" D．are found; there are so many islands