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 动词词义辨析。句意为：我们可能永远都不可能确定这种亚原子粒子的真正本质。assert“维护，主张”；impart“给予，传授”；ascertain“确定，查明”；notify“通知，公布”。因此，C选项符合题意。
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