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