90. Which of the following would be the best introductory sentence for the draft paragraph?

Answer: B

Explanation:

There are several reasons why colonization of the Moon would be difficult.

This introductory sentence sets the stage for discussing the challenges associated with colonizing the Moon, aligning with the context of the extract which emphasizes the struggles against greed and the underlying difficulties faced in pursuit of noble ambitions.

A) The establishment of human communities on the Moon has been seen as the next step in human exploration of space.

This statement implies a positive outlook on Moon colonization, suggesting readiness and potential. However, it does not address the difficulties or challenges implied in the extract, making it less suitable as an introductory sentence.

B) There are several reasons why colonization of the Moon would be difficult.

This option directly reflects the themes of struggle and challenge noted in the extract, making it an appropriate introductory sentence. It prepares the reader for a discussion on the obstacles faced, resonating with the author's sentiment of confronting significant hurdles.

C) There are a number of ways to overcome the problems associated with colonization of the Moon.

While this sentence suggests a proactive approach to challenges, it does not align with the tone of the extract, which focuses more on the difficulties and emotional struggles rather than solutions. As such, it does not serve as a fitting introduction.

D) Temperatures on the Moon would make it extremely difficult for human colonization.

This statement addresses a specific challenge but is too narrow to serve as an effective introductory sentence. It lacks the broader context of multiple challenges that the extract implies and therefore does not encapsulate the essence of the discussion.

Conclusion

Option B is the most appropriate introductory sentence as it encapsulates the essence of the struggles and challenges associated with lunar colonization, mirroring the extract's emphasis on the difficulties faced by humanity. The other options either present a positive outlook, focus on solutions, or are too specific, failing to capture the broader theme of hardship and resistance highlighted in the extract.