Which sentence contains a conjunctive adverb

Which rhetorical device is used in this excerpt from "the danger of lying in bed" by mark twain? "if i am going to travel by rail i shan't need it. lying at home in bed is the thing i am afraid of."

What do the excerpts have in common? both point out the tragic nature of situations in which children make journeys without their parents. both describe what immigrant children must do to survive when traveling to the united states. both explain why most children want to leave central america without their parents. both indicate the tragic problems and their consequences that children in central america must face.

Evaluate the tone of this cover letter. is it appropriate?