Question

July 1st of this year is ______ birthday of CPC (中国共产党)

1. A.
   ninety
2. B.
   the ninety
3. C.
   the ninetieth

Answer 1

C
本题含义为今年七月一日是中国共产党九十岁生日。表示生日通常用序数词，序数词前通常加定冠词the，90的序数词为ninetieth，故本题选C。