太阳通过树叶中的缝隙在地面上形成了很多光斑，有些光斑不规则，有些光斑是圆形的，仔细观察还会发现不规则的光斑往往比圆形光斑亮．同学们针对这一现象，提出几个问题，其中较有价值又可进行探究的问题是（　　）

    There are many places of interest in China.They1lots of visitors from all over the world every year.The most famous one among them is the Great Wall.It has a 2   of over two thousand years.It is about 6300kilometers 3.It is often called "Ten-Thousand﹣Li Great Wall"and it is one of the "Seven Wonders" of the ancient world.

    Besides the Great Wall，many rivers，such as the Yangtze River and the Yellow River are very4 as well.

    Among the rivers，the Yangtze River is the longest in China and the5   largest in the world after the Nile in Africa and the Amazon in South America.As the largest water system in China，the Yangtze River is very 6   to the country.

    Rivers and lakes are usually the birthplaces of Chinese culture.Have you heard of the7   love story about Xu Xian and White Snake？It is said that the story happened on West Lake a long time ago.West Lake is the most fantastic place that I have ever visited.It8   in the south﹣west of Hangzhou.Many tourist attractions in Hangzhou are worth9，such as Sudi Causeway，the Broken Bridge and Leifeng Pagoda.The scenery is so attractive that visitors often lose themselves in it.

    Now more and more foreign 10 choose to travel in China for its beautiful scenery.Why not have a trip with your family in the coming winter holiday？