Answer:
Allusion is the answer. It's mentioning the river and what it's known for but not telling you the name of the river.
Answer:
With respect to some concepts expressed here, I would like to add that if ppt is used primarily to graph concepts rather than to repeat texts, the teacher can constantly improvise and emphasize when he understands that it corresponds. In this way, the classes never become boring and the concepts exposition enjoy a graph that the teacher could never put on the board. For this reason the use of ppt has many advantages over other methods.
Explanation:
1) Although I am wealthy, I am unhappy
2) As she was bright and ambitious, she became a manager in no time.
3) Although my friends begged me, I chose not to go to the reunion.
4) As genes change over time, evolution progresses.
5) After being apart for years, he still had feelings for her.
6) You should take your car in for a service because it's starting to make weird noises.