阅读下面一首宋诗，然后回答问题。
                                                                                          宿云梦馆
                                                                                             欧阳修
                                                                     北雁来时岁欲昏，私书归梦杳难分。
                                                                     井桐叶落池荷尽，一夜西窗雨不闻。
                                         【注】欧阳修曾坐“朋党”之罪出放外任，这诗是外放时途经云梦驿馆之作。

杠杆的五要素：____、____、____、____、____．

①支点是指____；

②动力是指____；

③阻力是指____；

④动力臂是指____；

⑤阻力臂是指____．

有一个角是锐角的三角形,叫做锐角三角形．

    Most elephants are grey. Only a few are white. It's difficult to see a white elephant. When people find a white elephant, they feel excited.

    Long ago, a white elephant was taken to the king. Only the king could have a white elephant. And the white elephant must be a very good one. People wanted to take a look at the animal. On its way to the king, the white elephant attracted(吸引) many people. They ran into the street and shouted, “A white elephant is coming!”

    All the people liked the cute elephant. Some gave it water to drink. Others sang songs to the elephant. A boy put a red hat on the elephant's head.

    Then the elephant came to the king. At last the king saw the white elephant. The king gave it a name himself. The elephant ate from gold dishes and it began a new life.