____cold weather it is? 选哪个how,how a ,what,what a

选what
what cold weather it is
不用a 因为weather 不可数

如果用how
how cold the weather is
不加it

感叹句通常有what, how引导，表示赞美、惊叹、喜 悦、等感情。
what修饰名词，how 修饰形容词，副词或动词，感叹句结构主要有以下几种：
掌握它的搭配，即掌握了感叹句的重点。

How +形容词+ a +名词+ 陈述语序
How+形容词或副词+ 陈述语序
What +名词+ 陈述语序
What+a+形容词+名词+ 陈述语序
What+ 形容词+复数名词+ 陈述语序
What+ 形容词+不可数名词+ 陈述语序

也就是what + a/an + adj. + n. + 主语 +谓语
how + adj.+ a/an/the + n. + 主语 +谓语

How clever a boy he is!
How lovely the baby is!
What noise they are making!
What a clever boy he is!
What wonderful ideas (we have)!
What cold weather it is!
感叹句的省略形式为：
What a clever boy (he is)!

____cold weather it is! 选哪个how,how a ,what,what a
---选What [cold weather是名词短语，因此用 what,又由于weather是不可数名词，前面不加a 。]
what 引导名词,包括复数和不可数,可数
what a beautiful day!
what beautiful flowers they are!
what clean water it is!
而how 引导副词形容词.
how beautiful the day is !
how beautiful the flowers are!
how clean the water is!

how cold the weather is
what cold weather it is
不用a 因为weather 不可数

给你两个例句
HOW COLD THE WEATHER IS!
WHAT A COLD WEATHER IT IS!
感叹句要用"!",不是"?"