答案是C.
题干部分的意思是 “ 今天天气怎么样?”既可以用What's the weather like today?也可以用How's the weather today?来提问.
A.的意思是 “ 今天是周四”要用What day is it today?来提问
B.的意思是 “ 它很滑稽、好笑.”要用How's it 来提问
C.的意思是 “ 天气很好.”
故选择C.