Question

Which sentence in this excerpt from Ethan Frome by Edith Wharton uses a simile?
She laughed with pleasure, her head tilted back, the lamplight sparkling on her lips and teeth. "That would be lovely, Ethan!"
He kept his eyes fixed on her, marveling at the way her face changed with each turn of their talk, like a wheat-field under a summer breeze. It was intoxicating to find such magic in his clumsy words, and he longed to try new ways of using it.
"Would you be scared to go down the Corbury road with me on a night like this?" he asked.
Her cheeks burned redder. "I ain't any more scared than you are!

Answer 1

The sentence below uses a simile: 

He kept his eyes fixed on her, marveling at the way her face changed with each turn of their talk, like a wheat-field under a summer breeze.

A simile is a form of a figure of speech that uses comparison of one thing to another. In the sentence the face of the girl was compared to a wheat-field under a summer breeze because it changes every time she turned to talk.