读地球公转示意图，完成下列问题。
（2）据图可知，地球公转的方向是______________；地球在公转轨道上的位置不同，产生的地理意义是______________。
（3）当地球公转到ABCD中的哪一点时，学校所在地白天最长？______________；到哪一点时学校国旗旗杆正午的影子最长？______________。
（1）A夏至，B秋分，C冬至，D春分
（2）自西向东；季节变化
（3）A；C
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| 下面是一份网络上的旅游资料： Welcome to China Welcome to China. After you go to Beijing and Shanghai, you could see the differences between them. In some ways they look the same, in some ways they look different. Both of them have tall buildings and wide streets, although some buildings in Shanghai are much taller than those in Beijing. They both are important in China. Beijing is the capital of China; but Shanghai is the biggest city in China. And there are more famous interests in Beijing than those in Shanghai. You can go to the Great Wall, the Palace Museum and so on. Now they are becoming more and more important in China. And they are famous all over the world. 假设你是 Betty，你有个外国笔友叫 Linda，她准备来中国旅游，不知道去北京好还是上海好，请你在浏览完上面网页后，根据网页资料内容，给她回一封 E-mail，为她推荐一个城市并说明理由，同时给她提一点游览这个城市的建议。(字数在80词左右)开头和结尾已经给出，但不计入总词数。
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