2. 考研
  3. The passage focuses on ______. By immersing ore particles in water, ______.

The passage focuses on ______. By immersing ore particles in water, ______.

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问题 The passage focuses on ______.
By immersing ore particles in water, ______.
选项 A、we can get ore particles of equal size
B、we can purify aluminum particles
C、we can filter out aluminum
D、we can improve the working conditions around
答案C
解析 本题的依据是最后一句It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import．显然，把矿粒浸入水中的做法目的只有一个，即提取铝。故选C。
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