Final answer:
The appropriate use of a coordinating conjunction is demonstrated in 'The girl was thirsty, but she drank the lemonade.'
Step-by-step explanation:
The appropriate use of a coordinating conjunction to join two sentences is demonstrated in the sentence: The girl was thirsty, but she drank the lemonade. Here, the conjunction 'but' is used to connect two independent clauses 'The girl was thirsty' and 'she drank the lemonade'.
Learn more about Coordinating conjunctions