that............ .
A) they were much cleverer than their contemporaries
B) their backgrounds were full of aviation successes
C) they had the chance to try their work ,being aviators
D) they were inspired by their masters who made experiments before
E) their erstwhile efforts were praised, which encouraged them to go ahead
56- The author's main point in this passage is............. .
A) the advantage of the internal combustion engine in the Wright brothers
B) the Wright brothers' experience as pilots
C) the importance of knowing how to build and fly in kites and gliders
D) the reasons why the Wright brothers succeeded in manned flight
E) the Wright brothers' using different tools and techniques
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