题目

  Last Thursday, Michael and Linda stood behind large food trucks distributing meals to 4,000 homeless people for their wedding reception on the border town of Kilis. The couple had decided that instead of hosting their friends and family for a traditional feast reception, they would feed the victims from an earthquake-stricken area.     The idea came from the bridegroom's father, Ted, who volunteers for a Turkish relief organization. For the past few years, the organization has distributed daily meals to thousands of people who've suffered from natural disasters. He approached a 白夜为较高纬度地区特有的不黑之夜，前一天的黄昏尚未结束，次日黎明接踵而来，通宵达旦，天空不黑，故谓之白夜。这种现象的出现，与当地纬度等因素有关。据研究表明：只有当太阳位于地平线下18°，天空才会进入真正的黑夜。如果子夜0点，太阳光在地平线下的角度小于或等于18°时，黄昏和黎明便连在一起，形成奇特的“白夜”现象。据此回答10～11题。 10．北半球白夜现象发生的最低纬度以及该纬度出现白夜现象的时间分别是 A．66°34′N，春分前后                B．48°34′N，秋分前后 C．48°34′N，夏至前后                D．66°34′N，冬至前后 11．下列有关白夜与极昼现象描述不正确的是 A．极昼时太阳位于地平线之上，白夜时太阳位于地平线之下 B．极昼时光照为太阳发出的“本光”，白夜时为太阳经过大气后的折射和散射“光” C．极昼纬度分布范围较小，白夜纬度分布范围较大 D．纬度越低，极昼持续时间越短；纬度越低，白夜持续时间越长