填空题

Asia and North America were once connected with ice.

【参考答案】

Y

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The peoples of the Eastern and Western Hemispheres have been in close touch with each other since the beginning of history.

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很多人认为有必要举行CET-4考试，理由是……2．也有人持不同意见……3．我的看法。Is CET-4 Necessary