2. 外语
  3. Dams vary (in size) (from small rock barriers to) concrete structures (many feet) (height).

Dams vary (in size) (from small rock barriers to) concrete structures (many feet) (height).

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问题 Dams vary (in size) (from small rock barriers to) concrete structures (many feet) (height).
选项 A、in size
B、from small rock barriers to
C、many feet
D、height
答案D
解析 改为high。表示长度、重量等单位的名词后接形容词，结构为：数词+feet long/high。
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