His object is to gather as great a（ ）of material as possible.

His object is to gather as great a（ ）of material as possible.
A、difference
B、adversity
C、unity
D、diversity
【正确答案】：D
【题目解析】：本题考查名词辨析。difference：不同；adversity：逆境；unity：统一；diversity：多样性。句意：他的目标就是尽可能多地搜集各种材料。故D选项符合题意。