2. 外语
  3. These channels origin at topographic high points; the valleys widen " downstream" , some even displaying inner valleys.

These channels origin at topographic high points; the valleys widen " downstream" , some even displaying inner valleys.

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问题 These channels origin at topographic high points; the valleys widen " downstream" , some even displaying inner valleys.
选项
答案词性混用，应把origin改为originate。
解析 origin是名词，意思是“起源，由来”，其动词形式为originate，意思是“引起，发起，起源”。
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