President Obama called Armstrong, “Among the greatest of American heroes, just of his time.”[音频]
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It took NeilArmstrong and Edwin Aldrin _______ 3 hours to walk on themoon.[音频]
NeilArmstrong and Edwin Aldrin later traveled around theworld to share information about their ____________.
Inrecent years, Neil Armstrong had largely __________from public life.
PresidentObama called Armstrong,“Among the greatest of American heroes, of _______.”