Nowadays, a growing group of dieters are trying extreme calorie for a long life by eating less food.
A. reservation
B. restriction
C. distinction
D. discrimination
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A. reservation
(答案→)B. restriction
C. distinction
D. discrimination
解析：词义辨析。 A.预约 B. 限制；约束 C.区别 D. 歧视；区别。句意：当今，越来越多的人为了长生，正在尝试通过少吃食物来进行极端的能量限制。故选B。