What is the purpose of inventing the artificial tongue? ( )

(单选题)What’s the proper title for this passage? ( ) (单选题)On hearing “……there’s been a terrible mistake……” Frank was m (单选题)When he heard the knock at the door, Frank probably thought (单选题)Why did Frank dare to shout to his boss? ( ) (单选题)What do we know about Frank? ( ) (单选题)Readers did not ( ). (单选题)Doyle made up the description of Holmes ( ). (单选题)Holmes was supposed to have lived ( ). (单选题)Sherlock Holmes was ( ). (单选题)Where is the passage most probably taken from? ( )