2. 外语
  3. (The first) electric lamp had two carbon rods (from which) vapor (served) to conduct the current (across) the gap.

(The first) electric lamp had two carbon rods (from which) vapor (served) to conduct the current (across) the gap.

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问题 (The first) electric lamp had two carbon rods (from which) vapor (served) to conduct the current (across) the gap.
选项 A、The first
B、from which
C、served
D、across
答案B应改为by which。
解析 这里需要介词+关系词，按照语意，“在……周围，依赖……手段”用by。
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