Question

read the excerpt from chapter four of windows to the universe: revolutions in astronomy.
even before nasa launched the hubble space telescope in 1990, scientists were already planning for the next generation of space telescopes.
besides including a year, which phrase provides the best clue to the texts organization?
\even before\

asa launched\
\already planning\

ext generation\

Explanation:

The phrase "Even before" indicates a time - related sequence. It shows that the planning for the next - generation space telescopes occurred prior to the 1990 launch of the Hubble Space Telescope. This temporal cue helps in understanding the chronological organization of the text. "NASA launched" just refers to an action without indicating a broader organizational time - related structure. "Already planning" is a description of an action but not a strong organizational cue. "Next generation" is more about the type of telescopes rather than the text's organization in terms of time.

Answer:

"Even before"