Trắc nghiệm THPT Quốc gia năm 2017 môn Tiếng Anh chuyên đề Bài tập Đọc hiểu (có giải thích chi tiết)

First Man on the Moon
On July 16, 1969, America launched the Apollo 11, Lunar Landing Mission from Kennedy Space Center. This was a 363-foot-tall space vehicle, the five engines of which on the Saturn V rocket generated 7.5 million pounds of thrust. Twelve minutes after the launch, the astronauts were in orbit 120 miles above the Earth. [1] At a speed of 17,400 mph, they began their four-day journey to the moon. [2] They had nearly a quarter of a million miles to go.

On July 20, 1969, Neil Armstrong descended from the lunar module ladder. [3] Just prior to taking his first step on the moon, Armstrong pilled on a special ring, causing a TV camera to automatically deploy. As he stepped onto the moon’s surface he proclaimed, “That’s one small step for man, one giant leap for mankind.” [4] However, Armstrong inadvertently omitted the “a” before “man”. This error slightly changed the meaning of what was to become known as Armstrong’s famous statemen

Question 1: What is this passage mainly about?