问题详情

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！