2. 外语
  3. The book gives a brief______off the course of his research up till now.

The book gives a brief______off the course of his research up till now.

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问题 The book gives a brief______off the course of his research up till now.
选项 A、outline
B、reference
C、frame
D、outlook
答案A
解析 在给出的选项中：outline意为“大纲，梗概”；reference意为“参考”；frame意为“框架”；outlook意为“展望，观点”。根据句意和各个选项的意思可知，正确答案是A。
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