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.

admin2009-01-05  60
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 ascertain意为“查明，弄清，确定”，同answer，clear up，find out，learn，例如：We must ascertain the usual customs of the local people and arrange accordingly．我们必须了解当地人民的风俗习惯，作出相应安排。assert意为“肯定地说，断言；维护，坚持”，例如：Let me assert my film belief that the only thing we have to fear is
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