Question

______ fine weather! Let’s go out to have a picnic!

1. A.
   What a
2. B.
   How
3. C.
   What

Answer 1

C
考查感叹句，what + 名词，how + 形容词或副词，题中的名词为weather不可数名词，所以用what,前不能加冠词。故选C。