2. 外语
  3. A、A vacation trip to Yellowstone Park. B、A lecture by a visiting professor. C、Her biology thesis. D、A research project. D

A、A vacation trip to Yellowstone Park. B、A lecture by a visiting professor. C、Her biology thesis. D、A research project. D

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问题  
选项 A、A vacation trip to Yellowstone Park.
B、A lecture by a visiting professor.
C、Her biology thesis.
D、A research project.
答案D
解析
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大学英语六级

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