How many countries have walked on the moon?
A. 4
B. 5
C. 2
D. 3
Only three countries have ever soft-landed on the moon— the United States, the U.S.S.R. and now China.
A. 4
B. 5
C. 2
D. 3
Only three countries have ever soft-landed on the moon— the United States, the U.S.S.R. and now China.