There are several things that might be symbolized by the word bridge in this line from the poem, but perhaps one thing would be the connections that you form in life.
Not sure how it's an English question, but Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode.
The correct answer is:
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[D]: "<span>The men joke quietly, and smile rather than laugh" .
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