The main purpose of the last line of the passage is to signal the reader that steps will follow.
In the first part of the passage, the author is giving some <em>background information</em> about the topic, which functions as an introduction to develop the main topic. The last sentence serves <em>to trigger</em> what the passage is actually concerned in, that is, the different ways in which contamination by this bacterium can be avoided. Thus, what the reader is expecting after the last line are some steps to follow.
Answer: thats not much of a question but if you have options of sentences it sentence 3
Explanation:
To tell readers what they are looking at and why is the image is relevant
I believe it is an oxymoron
Answer:
the police station got robbed?
Explanation:
irony is when you say something which would normally be the opposite like the police station getting robbed for humour or emphatic effect
