2. 外语
  3. We shall probably never be able to______the exact nature of these sub-atomic particles.

We shall probably never be able to______the exact nature of these sub-atomic particles.

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问题 We shall probably never be able to______the exact nature of these sub-atomic particles.
选项 A、assert
B、impart
C、ascertain
D、notify
答案C
解析 本题中assert“断言，声称”；impart“传授，告知，透露”；ascertain“确定，查明，弄清”；notify“通知，告知，报告”。本题考查和nature搭配的动词，只有C符合要求。
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