设无向图G1 = áV1, E1?, 其中, V1 = {v1, v2, v3, v4, v5}, E1 = {(v1, v2), (v2, v3), (v3, v4), (v3, v3), (v4, v5)}，则v2的邻域 N(v2)为：

【单选题】【消耗次数：1】

① {v1, v2, v3}；

② {v1, v3}；

③ {v1, v2, v3, v4, v5}；

④ {v2}。

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