如图,AB∥CD,AE平分∠BAD,CD与AE相交于F,∠CFE=∠E.求证:AD∥BC.
证明:∵AE平分∠BAD,
∴∠1=∠2,
∵AB∥CD,∠CFE=∠E,
∴∠1=∠CFE=∠E,
∴∠2=∠E,
∴AD∥BC.
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在利物浦,赚取百分之百利润的买卖并不稀罕,有时一次出航所得净利可达百分之三百。1737年,运输号货船首次出航,装载了价值1307英镑的货物,它返回利物浦时,运来了殖民地产品和总额为3080英镑的汇总支票,其中还未把随运提交的棉花和蔗糖计算在内。
——《资本主义和奴隶制度》
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In our town, there is a big zoo with a lot of animals in it. There are so beautiful tigers and two old lions. They eat a lot of meat every day.There are also two big elephants and one baby elephant. The elephants are kind animals. They eat a lot every day. They like children. Children often give them bread and bananas. Elephants like bananas best. In our zoo there are also brown bears, black bears and white bears. They stand on their hind legs, hold up their four legs and ask for food. They like cakes very much. There's also a children's corner in our zoo. Children ride horses and donkeys and watch the monkeys there. The monkeys are very funny. They climb up ropes and jump down again and play with each other like small children.
—No wonder the emperors all wear clothes with dragons.