Question

now, little more than 40 years ago, astronauts descended the nine - rung ladder of the lunar module called eagle, and allowed their feet to touch the dusty surface of the earths only moon. (paragraph 9)
how does the speaker develop his purpose in this sentence?
the speaker develops his purpose that space exploration can advance only with the support of every citizen by describing a benefit of space exploration.
the speaker develops his purpose that space exploration has come a long way by describing an early achievement in the space program.
the speaker develops his purpose that space exploration is valuable by describing an important moment in the history of space exploration.
the speaker develops his purpose that space exploration is dangerous by describing a dangerous space mission that occurred at the beginning of the space program.

Explanation:

1. Analyze Option 1: The sentence doesn't mention citizen support or a benefit of space exploration, so this is incorrect.
2. Analyze Option 2: The event (Apollo moon landing) is not about showing how far space exploration has come in terms of progress over time, but about an important moment. So this is incorrect.
3. Analyze Option 3: The moon landing (astronauts touching the moon's surface) is a crucial moment in space exploration history. Describing it can develop the purpose that space exploration is valuable (as such a moment is significant and valuable). This matches.
4. Analyze Option 4: The sentence doesn't describe the mission as dangerous, so this is incorrect.

Answer:

C. The speaker develops his purpose that space exploration is valuable by describing an important moment in the history of space exploration.