问题补充：
As we all know, surfing Internet has now become popular means of obtaining information.
A. the; the
B. /; the
C. the; a
D. /; /
答案：
A. the; the
B. /; the
(答案→)C. the; a
D. /; /
解析：考查冠词。句意：正如我们所知，网上冲浪现在已经成为一种获得信息的流行手段。结合语境可知第一空特指因特网，第二空泛指任何一种流行手段，故选C。
