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高中英语选择1learning another language is like stepping out a door

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高中英语选择
1learning another language is like stepping out a door ,()i can look back ang see more clearly my own language.
a by which b which c through which d on which
2 scientists believe native americans arrived by crossing the land bridge that connected siberia and ()more than 10000 years ago
a this is alaska b alaska is now is now alaska d what is now alaska
说得好有悬赏
1 C 首先翻译一下,学习另一门语言就像步出一扇门,通过这扇门我可以回顾并巩固我的母语.括号处的意思是通过这一扇门,选项C符合这个意思,A项by是“用”的意思,B缺少介词,句子不通顺,D项on是在...之上,都不符合
2.D 科学家们相信美国本土人是在10000年前跨越大陆桥过来的,这座大陆桥连接着西伯利亚和现在的阿拉斯加.括号里面应该加个名词或名词性从句,如果是名词就填Alaska,如果是名词性从句就填what is now Alaska.