问题补充：
--It’s not a good habit to play basketball after meals at once.
-- Yes, you should have rest first.
A. a, /
B. the, a
C. a, the
D. /, a
答案：
A. a, /
B. the, a
C. a, the
(答案→)D. /, a
解析：句意：饭后马上打篮球不是个好习惯。是的，你应该先休息一下。球类前不加冠词，have a rest休息一下，固定短语，故选D.
