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【题目】贵州一学校的课外活动小组,于某日观测到其所在学校某时刻的树影如下图所示(箭头表示方位)。据此完成下面小题。

1此时该学校所在地可能为北京时间(  )

A. 155:30 B. 32118:30

C. 785:30 D. 51012:30

2该日(  )

A. 南极圈内极昼范围最大 B. 塔里木河正值丰水期(夏季)

C. 莫斯科的昼长比北京短 D. 地球公转速度最快

【答案】

1C

2B

【解析】试题解析:

1】根据图示,树影在西南方,则此时太阳在东北方;另外树影的长度明显长于树高,则图示时间为上午某个时刻。根据太阳直射点北半球时全球各地(除极昼极夜地区外)东北日出,推测此时为夏半年某一天,则可能为786:30。故选C

2】该日,为北半球夏季,气温高,塔里木河的冰川融水补给量最大,处于丰水期。太阳直射北半球,北半球昼长夜短,纬度越高,昼长越长,北极圈内出现极昼现象;莫斯科纬度比北京高,其昼长比北京长;南半球昼短夜长,南极圈内出现极夜现象。此时地球位于远日点附近,公转速度最慢。故选B

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