By the end of the twentieth century, how many people traveled by air each year?(1 point)
Responses
A. 1.8 billion people
B. 18.1 million people
C. 11.3 million people
D. 5 billion people
1 answer
A. 1.8 billion people
Responses
A. 1.8 billion people
B. 18.1 million people
C. 11.3 million people
D. 5 billion people
1 answer