完型填空.

    Animals are our friends. We can find1different kinds of animals. Some animals are living 2 big woods(森林). And some animals are living with 3. Animals are very4 to people. People can teach the elephant to do some heavy 5. And they can also teach the dog to 6the house. A watch dog is very 7 It can help people in danger(危险). So people 8dogs very much. Most of9like to go to the zoo.10there are many animals in zoos. Zoo is a good place for children to get to know animals.

The policeman warned the young man____ after drinking.

在我国各类地形比例示意图中，表示山地的是（  ）

自然灾害给人类带来磨难，同时又促使人类更加自觉地去认识和把握自然规律、增强抵御自然灾害能力，进而推动人类文明进步。正如恩格斯所说，“没有哪一次巨大的历史灾难，不是以历史的进步为补偿的”。从灾难到进步，其中体现的深刻哲理是   （   ）
①“灾难”和“进步”作为矛盾双方，包含着向对立面转化的趋势 
②“灾难”向“进步”转化是无条件的，体现了矛盾双方的互相贯通 
③“灾难”在一定条件下可以向“进步”转化，体现了矛盾的同一性 
④“灾难”促进“进步”在一定程度上体现了某些外因的决定作用

命题“$\forall x\in R,x^2\ge 0$”的否定为 (     )