Ring Out Bow Bells - Language devices

The writer uses a simile to describe the river in the second sentence. What is the simile and why is it

effective?

"Between the north bank and the south, like a great wall across the river, lay London Bridge."

Which language device is being used here? (1 mark)

Why is it effective? (2 marks)

What does the author compare to "an imprisoned beast?"

Why do you think this is an effective comparison?

Find an example of onomatopoeia in the text. Explain why the author chose to use this language device.