Scientists believe native Americans arrived by crossing the land bridge that connected Siberia(西伯利亚)and more than 10，000 years ago．
| A．this is Alaska | B．Alaska is now | C．is now Alaska | D．what is now Alaska |
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Scientists believe native Americans arrived by crossing the land bridge that connected Siberia(西伯利亚)and more than 10，000 years ago．
| A．this is Alaska | B．Alaska is now | C．is now Alaska | D．what is now Alaska |
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