问题补充：
- How can you keep such a good shape, Ms Freda?
-Im on diet and takes Yoga as regular exercise.
A. a; the
B. the; a
C. a; a
D. the; the
答案：
A. a; the
B. the; a
(答案→)C. a; a
D. the; the
解析：句意：——弗雷达女士，你如何保持这么好的身材？——我节食减肥，把做瑜伽当做有规律的锻炼。on a diet节食，减肥； a regular exercise一项有规律的锻炼。故选C。
