We
a lovely three weeks in the south of Spain last year.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

i think the answer is invented words, rhyming knack, alliteration, and, metaphor.

the author motivation is to show the power of animal-human relationships.