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수능 영어 · 문장 삽입 [3점]

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주어진 문장

Yet none of them can see the delay that this choice imposes on everyone else.

Intuition says that adding a road should reduce congestion. ( 1 ) In certain networks, however, a new link tempts many drivers onto a single shortcut. ( 2 ) The shortcut itself may be fast, but it funnels traffic onto the streets that feed it, and routes that were once smooth begin to back up. ( 3 ) Each driver, by taking the quicker option on offer, makes a perfectly rational choice. ( 4 ) That is why the sum of such choices leaves the whole system slower than before. Planners who grasp this sometimes improve traffic by closing a road rather than by opening one.

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