第29届奥林匹克运动会于北京时间2008年8月8日20∶00在北京开幕。

问题综合

第29届奥林匹克运动会于北京时间2008年8月8日20∶00在北京开幕。下图为此时的北半球太阳照射投影图，读图回答下列问题。（15分）

(1)在图中用“☆”标出太阳直射点的大致位置。（2分）

(2)弧线AC为　　　　 (晨线或昏线)。（2分）

（3）若从图中A处乘飞机沿最短航线飞到C处，则飞机的航程大约为　　　　。(选择填空) （2分）

A．5 000千米 B．6 371千米

C．10 000千米 D．20 000千米

(4)此时，世界时为________日________时，与北京日期相同的范围占________。(选择填空) （3分）

A．全球四分之一 B．全球三分之一

C．全球二分之一 D．全球

（5）写出此日北京的昼夜长短状况及奥运会期间昼夜长短的变化情况。（3分）

（6）此时，图中与C点太阳高度相同的地点为________点。D点正午太阳高度年变化的范围____________________________________________________________。（3分）

答案

（1）略。(提示：画在0°经线上的赤道与北回归线之间中间位置)

(2)晨线

(3)　C

(4)8 12　D

(5)昼长夜短；昼渐短夜渐长。

(6A、B　0°～23°26′

题目分析：

（1）北京时间2008年8月8日20∶00，太阳直射点位于白天的中央，赤道与北回归线之间中间位置。

（2）北极上空俯视，逆时针方向，弧线AC是由黑夜进入白天，为晨线。

（3）A处到C处比A处到D处略长，A处到D处为90°，经线上1°大约为111千米，距离大约为10 000千米。

（4）北京时间2008年8月8日20∶00，根据东加西减，世界时（0°经线）时间为8日12∶00；日界线有两条，一条是0时经线，另一条是180°经线，北京时间2008年8月8日20∶00，0时和180°经线重合，与北京日期相同的范围占全球。

（5）北京时间2008年8月8日20∶00，北京昼长夜短；奥运会期间，昼渐短夜渐长。

（6）C点位于晨昏线，太阳高度为0，与C点相同的是A、B。D点为北极点，正午太阳高度最大为23°26′，最小为0°。

点评：本题难度适中。要求学生熟练掌握地球自转和公转的地理意义。

完形填空。
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