What does the news item mainly talk about？A．The Curiosity rover finally got on Mars after

What does the news item mainly talk about？

A．The Curiosity rover finally got on Mars after eight months cruising.

B．NASA launched a new spaceship—the Curiosity rover.

C．Astronauts getting on Mars would develop cancer due to radiation.

D．Astronauts can be protected from the radiation by lots of methods.

请帮忙给出正确答案和分析，谢谢！

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