题文
---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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