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This selection is mainly about how
A astronauts helped create a new training shoe.
B waffle soles improved athletic shoes.
C people market and sell their inventions.
D trainers have changed over the past centuries.
The correct answer is B: waffle soles improved athletic shoes.
This selection likely focuses on the development and impact of waffle sole design in athletic footwear, emphasizing how this innovation has enhanced performance and comfort for athletes. If you need more detailed explanations or have other questions, feel free to ask!