【題目】 北京時間（東八區(qū)）2018年5月21日5時28分，成先生在西昌衛(wèi)星發(fā)射中心觀看了探月工程嫦娥四號——“鵲橋”號成功發(fā)射升空。

據(jù)此完成下列各小題。

【1】我國在莫斯科（東三區(qū)）的留學生收看衛(wèi)星發(fā)射的直播時，正是當?shù)氐模?）

A.日出前后B.正午前后C.日落前后D.午夜前后

【2】衛(wèi)星發(fā)射當日，赤道上的基多（ ）

A.晝短夜長B.晝長夜短C.晝夜平分D.出現(xiàn)極夜

【答案】

【1】D

【2】C

【解析】

根據(jù)相鄰的兩個時區(qū)的區(qū)時相差1小時，按照“東加西減”，即求東側的用加法，求西側的用減法，進行推算；當太陽光直射在南回歸線上時，這一天稱為冬至日，為12月22日，北半球晝短夜長，北極圈以內(nèi)地區(qū)有極夜現(xiàn)象；當太陽光直射在北回歸線上時，這一天稱為夏至日，為6月22日，北半球晝長夜短，北極圈以內(nèi)地區(qū)有極晝現(xiàn)象；當太陽光第一次直射在赤道上時，這一天稱為春分日，為3月21日，全球晝夜平分；第二次直射在赤道上時為秋分日，為9月23日，全球晝夜平分，進行分析解答。

【1】莫斯科位于東三區(qū)，與北京所在東八區(qū)相差5個時區(qū)，也就是相差5個小時，按照東加西減的原則，北京時間（東八區(qū)）2018年5月21日5時28分，莫斯科（東三區(qū)）的時間為2018年5月21日0時28分，正是當?shù)氐奈缫骨昂�。故選：D。

【2】一年中，不論什么時間赤道上晝夜平分，故基多為晝夜平分。故選：C。

考查時差的計算機晝夜長短的變化。

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