【題目】貴州一學校的課外活動小組,于某日觀測到其所在學校某時刻的樹影如下圖所示(箭頭表示方位)。據(jù)此完成下面小題。

1此時該學校所在地可能為北京時間(  )

A. 155:30 B. 32118:30

C. 785:30 D. 51012:30

2該日(  )

A. 南極圈內(nèi)極晝范圍最大 B. 塔里木河正值豐水期(夏季)

C. 莫斯科的晝長比北京短 D. 地球公轉(zhuǎn)速度最快

【答案】

1C

2B

【解析】試題解析:

1】根據(jù)圖示,樹影在西南方,則此時太陽在東北方;另外樹影的長度明顯長于樹高,則圖示時間為上午某個時刻。根據(jù)太陽直射點北半球時全球各地(除極晝極夜地區(qū)外)東北日出,推測此時為夏半年某一天,則可能為786:30。故選C

2】該日,為北半球夏季,氣溫高,塔里木河的冰川融水補給量最大,處于豐水期。太陽直射北半球,北半球晝長夜短,緯度越高,晝長越長,北極圈內(nèi)出現(xiàn)極晝現(xiàn)象;莫斯科緯度比北京高,其晝長比北京長;南半球晝短夜長,南極圈內(nèi)出現(xiàn)極夜現(xiàn)象。此時地球位于遠日點附近,公轉(zhuǎn)速度最慢。故選B。

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