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如图,直线 AB,CD 相交于点 O,OE 平分∠AOD,OF⊥OC,


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Living places

The home of the elephant is in the deep forest. It is the largest of all land animals, and is found both in Asia and Africa. One of the main places in Asia where the elephant lives is the island of Ceylon. The huge forests on the island become the home of thousands of elephants. The trees grow thick and tall. They make many parts almost dark, while bright sunlight is above and around them.

Living habits

The elephant likes the deep part and the coolest places of the forest. There he will stand swinging his ears, to drive away the flies; or he will pull down a branch (树枝) from a tree to fan himself. He likes bathing, and to be near a lake or running water. There he takes in the water with his trunk, and spreads it all over his body.

Food

The elephant enjoys the fruits in the forest, and also the leaves of the trees. There is plenty of food for him in the forests, though he is not always happy with what he finds there.

Way of movement

When a group of elephants moves about in the forest, the oldest goes first. The young elephants and their mothers are in the middle, where they are safest. Then all move along with a great noise, the branches of the trees bending and breaking before them. Though the elephant is usually harmless, no one dares to attack (袭击) a group of them moving through the forest.

How people treat them

In Asia the elephant is trained to work. At one time the African elephant also was trained. Soldiers in ancient times often went to fight on the backs of African elephants. But now the elephant that lives in Africa is illegally (非法地) hunted mainly for its valuable ivory. In order to protect them, governments around the world have developed laws to stop this.

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保尔不知不觉走到松林跟前,在岔路口停住了。右边是阴森森的老监狱,有一道高高的尖头木栅栏,把它和松林隔开。监狱后面是医院的白色楼房。
就是在这里,在这空旷的广场上,瓦莉亚和她的同志们被绞死了。保尔在原来设置绞架的地方默默地站了一会儿,然后走向陡坡,顺坡下去,到了埋葬烈士的墓地。
不知道是哪个有心人,在坟墓周围摆上了用云杉枝编的花圈,像给这块小小的墓地修了一道绿色的围墙。陡坡上挺拔的松树高高矗立,峡谷的斜坡上绿草如茵。
这里是小城的边缘,寂静而冷清。松林在低语,春天的大地在复苏,散发着潮湿的泥土气息。同志们就是在这里英勇就义的。他们为那些出生即贫贱、落地便为奴的人能过上美好的生活,献出了自己的生命。
保尔慢慢地摘下了帽子。悲痛,巨大的悲痛,充满了他的心。
人最宝贵的是生命。生命每个人只有一次。人的一生应当这样度过:回首往事,他不会因为虚度年华而悔恨,也不会因为卑鄙庸俗而羞愧;临终之际,他能够说:“我的整个生命和全部精力,都献给了世界上最壮丽的事业——为解放全人类而斗争。”要抓紧时间赶快生活,因为一场莫名其妙的疾病,或者一个意外的悲惨事件,都会使生命中断。
保尔怀着这样的思想,离开了烈士墓。
                                            (节选自奥斯特洛夫斯基的《钢铁是怎样炼成的》 )