31. Which of the following best describes the content of the passage?
Your Answer is
Correct Answer is B
Explanation
The entire article describes the function and structure of the various parts of the egg. Item B: Professionally introduced the growth of bird eggs, in line with the main purpose of the article.
Item A: The article is about the structure of bird eggs. Only the occasional comparison with reptile eggs.
Item C: There is no mention of the comparison between the present and the past.
Item D: It is not the main purpose of the article. It is mainly about introducing bird eggs, not comparing them.