古希腊著名的毕达哥拉斯学派把1，3，6，10…这样的数称为“三角形数”，而把1，4，9，16…这样的数称为“正方形数”．从图中可以发现，任何一个大于1的“正方形数”都可以看作两个相邻“三角形数”之和．下列等式中，符合这一规律的是（　　）

下图是5月12日江西九江和庐山风景区(距离九江19 km)的天气预报。阅读该日天气预报，该日九江和庐山风景区的天气是(    )

    “Leave a place better than you found it.” It is a 1 philosophy, but one that William Lindesay

    2 dear.On April 22, which was also Earth Day, he led twenty 3 to help clean up the Jiankou section of the Great Wall.

    “He who 4 is the owner,” William said in the 5 remarks of the cleanup event in 2000.“The Great Wall 6China, and is also one of the greatest 7 in the world.Everyone has a 8 to protect it.Every day should be Earth Day,” he said.

    During the past three decades, he has spent most of his time 9 and exploring the Great Wall and has developed his own 10 to protect the cultural relic.

    “It's a 11 thing that people are going out to enjoy themselves and to 12 the great history and heritage, 13 it's also quite dangerous if they don't 14 how fragile (易损坏的) the historical sites are and how fragile the 15 is,” William said.

    In 1989, his first 16Alone on the Great Wall was published, and he has published another five books about the Great Wall since then.In 2001, he 17 International Friends of the Great Wall, a(n)

    18 whose efforts are aimed at protecting this 19to the past.

    His next step is to organize exhibitions about the Great Wall as a 20 over the last 400 years.

    The exhibitions are expected to be held in Beijing, London, Paris and Washington DC.