如图，在△ABC中，DE∥BC，DE与边AB相交于点D，与边AC相交于点E，如果AD=3，BD=4，AE=2，那么AC=____．

亚洲温带大陆性气候分布最广。

一张纸上画了一只鸡、一头牛和一片草地，要求把这三样东西分成两组，你会怎么分呢？实验表明，美国孩子更喜欢把鸡和牛分在一组，中国孩子则倾向于把牛和草地分在一组。心理学家认为，美国人善于分析不同物体各自的特征，牛和鸡都属于动物，因此分在一起；中国人则把不同物体之间的联系看得更重，因为牛吃草，所以把牛和草地分在一起。这说明（     ）

根据短文内容，选择正确答案。

    Thomas is an office clerk. Every day he is busy with his work. After a day's work he is often very tired. His wife, Katherine, has no job, so she stays at home to cook the meals. Every day he can have his dinner when he gets home from office.

    One day, Thomas came home very late because he was very busy with an important paper. He was very hungry when he got home. When he found dinner was not ready he was very angry with his wife. He shouted at her, “I'm going to have dinner in a restaurant.” “Wait for five minutes,” said his wife. “Why? Do you think that dinner will be ready in five minutes?” asked Thomas.

    "Of course not,” she answered. “But I can be ready to go with you in five minutes.”