EXERCISE 2: Choose the correct answer according to the passage.
1. According to the passage, over 500 years before the first balloon flight
A) boomerangs were the only means of air travel for men
B) men didn't even know how to fire arrows
C) Leonardo da Vinci studied the flight of birds and drew flying machines
D) successful "orthopters" had already been transporting people by air
E) knowledgeable men believed successful flights would be achieved one day
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