根据以下这首诗回答以下问题：What does the poet say the woods are “lovely,dark and deep’?
My little horse must think it queer
To stop without a farmhouse near
Between the woods and frozen lake
The darkest evening of the year.
He gives his harness bells a shake
To ask if there is some mistake.
The only other sound's the sweep
Of easy wind and downy flake.
The woods are lovely,dark and deep.
But I have promises to keep,
And miles to go before I sleep,
And miles to go before I sleep