—How amazing it is that astronauts are exploring outer space!
—It's a challenge, I guess, ______ man against nature.
| A．of | B．for |
| C．by | D．about |
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—How amazing it is that astronauts are exploring outer space!
—It's a challenge, I guess, ______ man against nature.
| A．of | B．for |
| C．by | D．about |
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