2. 外语
  3. ______, particularly the oxides of sulfur, greatly increases the rate at which rust forms.

______, particularly the oxides of sulfur, greatly increases the rate at which rust forms.

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问题 ______, particularly the oxides of sulfur, greatly increases the rate at which rust forms.
选项 A、The presence of air pollutants
B、Air pollutants are present
C、Because the presence of air pollutants
D、Air pollutants whose presence
答案A
解析
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