2. 外语
  3. It is A(estimated) that a scientific principle has B(a life expectancy) of approximately C(a decade) before D(it drastically) re

It is A(estimated) that a scientific principle has B(a life expectancy) of approximately C(a decade) before D(it drastically) re

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问题 It is A(estimated) that a scientific principle has B(a life expectancy) of approximately C(a decade) before D(it drastically) revised or replaced by newer information.
选项
答案D
解析 it drastically改为it is drastically，用被动语态。
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