2. 外语
  3. Which minerals have been proved to be insufficient? What does the word "preliminary" in the last paragraph mean?

Which minerals have been proved to be insufficient? What does the word "preliminary" in the last paragraph mean?

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问题 Which minerals have been proved to be insufficient?
What does the word "preliminary" in the last paragraph mean?
选项 A、Predictable.
B、Preparatory.
C、Premature.
D、Previous.
答案B
解析
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