input: Write a python function to recognize spoken words from a predefined list of emotions using the SpeechRecognition library.
  assert recognize_emotion(['happy', 'sad', 'angry'], 'happy') == "The emotion of the word is: happy"
  assert recognize_emotion(['happy', 'sad', 'angry'], 'joyful') == "The word is unknown."
  assert recognize_emotion(['happy', 'sad', 'angry'], 'angry') == "The emotion of the word is: angry"
output: import speech_recognition as sr
  
  def recognize_emotion(emotions_list, spoken_word):
      if spoken_word in emotions_list:
          return f"The emotion of the word is: {spoken_word}"
      else:
          return "The word is unknown."