As matter of fact, number of young couples who plan to have a second kid is increasing rapidly.
A. the; a
B. a; the
C. a; a
D. 不填；the
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A. the; a
(答案→)B. a; the
C. a; a
D. 不填；the
解析：句意：事实上，计划生第二个孩子的年轻夫妇的数量在上升。As a matter of fact“事实上”，第二空填the ，the number of…的数量，后面的谓语是单数，选B。