thirty minutes和thirty-minute的区别是什么

Question

CCTV is the biggest television station in China.Its _____evening news.
A.thirty minute B.thirty minutes C.thirty-minute
跪求 明早就要上场!!!

Answer 1

选c thirty-minute相当于形容词，直接做定语；thirty minutes只是单纯的指30分钟，如果做定语的话要加's。

Answer 2

C
thirty minutes是名词
thirty-minute 是形容词

Answer 3

C