【題目】 北京時(shí)間（東八區(qū)）2018年5月21日5時(shí)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(hào)——“鵲橋”號(hào)成功發(fā)射升空。

據(jù)此完成下列各小題。

【1】我國(guó)在莫斯科（東三區(qū)）的留學(xué)生收看衛(wèi)星發(fā)射的直播時(shí)，正是當(dāng)?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(dāng)日，赤道上的基多（ ）

A.晝短夜長(zhǎng)B.晝長(zhǎng)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(gè)時(shí)區(qū)的區(qū)時(shí)相差1小時(shí)，按照“東加西減”，即求東側(cè)的用加法，求西側(cè)的用減法，進(jìn)行推算；當(dāng)太陽(yáng)光直射在南回歸線上時(shí)，這一天稱為冬至日，為12月22日，北半球晝短夜長(zhǎng)，北極圈以內(nèi)地區(qū)有極夜現(xiàn)象；當(dāng)太陽(yáng)光直射在北回歸線上時(shí)，這一天稱為夏至日，為6月22日，北半球晝長(zhǎng)夜短，北極圈以內(nèi)地區(qū)有極晝現(xiàn)象；當(dāng)太陽(yáng)光第一次直射在赤道上時(shí)，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(shí)為秋分日，為9月23日，全球晝夜平分，進(jìn)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(gè)時(shí)區(qū)，也就是相差5個(gè)小時(shí)，按照東加西減的原則，北京時(shí)間（東八區(qū)）2018年5月21日5時(shí)28分，莫斯科（東三區(qū)）的時(shí)間為2018年5月21日0時(shí)28分，正是當(dāng)?shù)氐奈缫骨昂�。故選：D。

【2】一年中，不論什么時(shí)間赤道上晝夜平分，故基多為晝夜平分。故選：C。

考查時(shí)差的計(jì)算機(jī)晝夜長(zhǎng)短的變化。

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