2. 外语
  3. The chief (commercial) source of bromine is ocean water, from (what) the element is extracted by (means of) chemical (replacemen

The chief (commercial) source of bromine is ocean water, from (what) the element is extracted by (means of) chemical (replacemen

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问题 The chief (commercial) source of bromine is ocean water, from (what) the element is extracted by (means of) chemical (replacement) by chlorine.
选项 A、commercial
B、what
C、means of
D、replacement
答案B
解析
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