2. 外语
  3. Among the following rivers,______forms a natural boundary between Mexico and the U.S.

Among the following rivers,______forms a natural boundary between Mexico and the U.S.

admin2012-07-11  22
问题 Among the following rivers,______forms a natural boundary between Mexico and the U.S.
选项 A、the Potomac River
B、the Columbia River
C、the Rio Grande River
D、the Colorado River
答案C
解析
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