阅读短文，选择正确答案。 July 20th, 1969 was an important day. Two Americans landed on the moon. Their names were Armstrong and Aladdin. They went there by spaceship. Its name was Apollo. Apollo left Cape Kennedy on July 16th, and went three hundred and eighty-four thousand kilometers. It took the two Americans two days to get there. On July 20th, the spaceship landed in the Sea of Tranquility (宁静). Armstrong first stepped onto the moon. The two men walked on the ground of the moon. They picked some stones and put them in the spaceship. They jumped up and down. They were tired after their moon walk, so they rested. On July 21st, Apollo left the moon and returned to the earth. Three days later, it came down in the Pacific Ocean (太平洋). A ship took the two men to America. 1. Apollo was the name of _______. [     ] A. an American B. a machine C. a spaceship D. an invention 2. Here, 'the Sea of Tranquility' means _______. [     ] A. the world B. the earth C. the sun D. the moon 3. The word 'stepped' in the sentence 'Armstrong first stepped onto the moon.' Means ______. [     ] A. walked B. stopped C. flew D. ran 4. It's _______ kilometers from the earth to the moon. [     ] A. 385 B. 2,850 C. 38,500 D. 384,000 5. July 20th,1969 was an important day, because _______. [     ] A. Apollo landed on the moon. B. it was the first time for humans to land on the moon. C. two Americans had seen the moon. D. it was the first time for humans to make a spaceship