1-C. They crossed a land bridge to Europe.They crossed a land bridge to Europe.
彼らは、陸橋を渡った、ヨーロッパへのダヨ。
2-C. It has been generally thought that the first people to go to North America came from Asia over a bridge of land across the Bering Sea about 15,000 years ago.It has been generally thought that the first people to go to North America came from Asia over a bridge of land across the Bering Sea about 15,000 years ago.