C
这个是考察how和what引导的感叹句的区别
what+(a/an)+adj.+n.+主语+谓语+(it is).
如：① What a clever girl she is!多么聪明的姑娘呀!② What an interesting story it is!多么有趣的故事呀!③ What good children they are!他们是多么好的孩子呀!④ What beautiful flowers they are!多么漂亮的花呀!⑤ What delicious food it is!多么有味的食物呀!⑥ What heavy snow it is!多么大的雪呀!
How+adj.（adv.）+主语+谓语+(it is).
如：① How cold it is today!今天多么冷呀!② How nice the pictures are!多么漂亮的图画呀!③ How happy they look!他们显得多么高兴呀!④ How well she sings!她唱得多好呀!⑤ How hard they are working now!他们干得多么起劲呀!