11 . $\qquad$'s left foot stepped on the moon, leaving the classic words $\qquad$ "That's one small step for a man, one giant leap for mankind".
A. Apollo
B. Michael $\cdot$ Collins
C. Armstrong
D. Aldrin
【Answer】C
【Analysis】On July 16, 1969, Neil Armstrong, along with Buzz Aldrin and Michael Collins, flew to the moon aboard the "Apollo 11" spacecraft. Four days later, at 4:18 PM Eastern Daylight Time, he manually controlled the "Eagle" lunar module to land on a flat area near the southwestern edge of the Sea of Tranquility. On July 21, at 10:56 PM Eastern Daylight Time, mission commander Armstrong climbed out of the airlock door of the lunar module, stayed on the 5-meter-high entry platform for a few minutes to calm his excited emotions. Then he extended his left foot and slowly descended the ladder on the landing platform toward the lunar surface. He paused slightly at each step to acclimate his body to the lunar gravity environment. It took him 3 minutes to walk down the 9 steps, and at 4:07, he carefully touched his left foot to the lunar surface, then mustered the courage to place his right foot on the lunar surface as well. Thus, the first human footprint was left on the desolate and silent land of the moon. At that moment, he uttered the famous quote that has been frequently cited in countless settings: "That's one small step for a man, one giant leap for mankind." This famous quote has inspired generation after generation of aerospace professionals to explore the vast universe.