Armstrong and Aldrin spoke to President Richard Nixon by radio telephone. They set up scientific experiments, 　19　soil samples and planted an American flag on the surface of the moon. They also　20　a plaque (板; 片) that reads: We came in peace for all mankind. Though the flag was blown over when the lunar module took off, the footprints left by the astronauts are still there.　

　　1. A. aloneB. lonelyC. happilyD. excited

　　2. A. welcomedB. greetedC. partedD. joined

　　3. A. setsB. imagesC. broadcastD. current

　　4. A. actedB. feltC. thoughtD. spoke

　　5. A. triedB. racedC. failedD. managed

　　6. A. existedB. separatedC. unitedD. stood

　　7. A. secondB. lastC. firstD. finally

　　8. A. discoveriesB. journeysC. travelsD. history

　　9. A. tripB. heightC. differenceD. time

　　10. A. showedB. tookC. indicatedD. changed

　　11. A. to and fromB. from and toC. back toD. back from

　　12. A. easyB. long　C. shortD. tense

　　13. A. imaginedB. supposedC. expectedD. guessed

　　14. A. less thanB. more thanC. at leastD. another

　　15. A. flew offB. touched down　C. lay downD. slowed down

　　16. A. reportedB. signedC. respondedD. replied

　　17. A. gladB. excitedC. anxiousD. blue

　　18. A. speakingB. breathingC. walkingD. working

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