下列成语书写完全正确的一项是（    ）

忆秦娥

李白

箫声咽。秦娥梦断秦楼月。秦楼月。年年柳色，灞陵伤别。

乐游原上清秋节。咸阳古道音尘绝。音尘绝，西风残照，汉家陵阙。

忆秦娥·娄山关

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西风烈，长空雁叫霜晨月。霜晨月，马蹄声碎，喇叭声咽。

雄关漫道真如铁，而今迈步从头越。从头越，苍山如海，残阳如血。

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    It is August in Qingdao. It's very 1 here. Now, there are many people 2 vacation. They go to the beach and have 3   good time there. Today is 4, and it is not very hot. On the beach, a lot of people 5 to their friends 6 looking at the beautiful sea. Some of them are 7. Others are taking 8. Can you find 9? I'm the boy in blue shorts. I'm going to surf. It's  10. 

请探究两个等腰三角形相似的条件，用文字语言直接写出探究的结果即可．