Which is the topic sentence in the first paragraph?
举一反三
- The topic sentence of a paragraph is not always the first sentence of the paragraph.
- The first sentence in paragraph 7 is the topic sentence of only this paragraph.
- Which of the following is the topic sentence of the topic second paragraph?
- Which paragraph lacks a topic sentence?
- Which sentence is the topic sentence in paragraph 1 and why? （15.0 points）