What is the age of the universe according to the passage? What is the probable meaning of "pinning down" in the Paragraph 2?

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问题 What is the age of the universe according to the passage?
What is the probable meaning of "pinning down" in the Paragraph 2?

选项 A、Forcing.
B、Discovering exact details about.
C、Pressing.
D、Knowing about.

答案B

解析首先得通过上下文来判断一下，以下四项哪项更符合前后文的意思呢? 其次还可以掌握pin down是一个短语动词，其义有三：①钉，钉住；②详细说明；③压住，压制。结合两项可以推断文中选取pin down的第二层含义。故正确的选择为B。

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大学英语三级A级

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