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The common hippopotamus (Hippopotamus amphibius), or hippo, is a large, mostlyherbivorous mammal in sub-Saharan Africa, and one of only two extant species in thefamily Hippopotamidae, the other being thepygmy hippopotamus (Choeropsis liberiensisor Hexaprotodon liberiensis). The name comes from the ancient Greek for "river horse" (ἱπποπόταμος). After the elephant andrhinoceros, the common hippopotamus is the third-largest type of land mammal and the heaviest extant artiodactyl. Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the Hippopotamidae arecetaceans (whales, porpoises, etc.) from which they diverged about55 million years ago. The common ancestor of whales and hippos split from other even-toed ungulates around 60 million years ago. The earliest known hippopotamus fossils, belonging to the genus Kenyapotamus in Africa, date to around 16 million years ago.
Common hippos are recognisable by their barrel-shaped torsos, wide-opening mouths revealing large canine tusks, nearly hairless bodies, columnar-like legs and large size; adults average 1,500 kg (3,300 lb) and 1,300 kg (2,900 lb) for males and females respectively, making them the largest species of land mammal after the three species of elephants and the white and Indian rhinoceros. Despite its stocky shape and short legs, it is capable of running 30 km/h (19 mph) over short distances. The hippopotamus is a highly aggressive and unpredictable animal and is ranked among the most dangerous animals in Africa.[3]Nevertheless, they are still threatened by habitat loss and poaching for their meat andivory canine teeth.
The common hippopotamus is semiaquatic, inhabiting rivers, lakes and mangroveswamps, where territorial bulls preside over a stretch of river and groups of five to thirty females and young. During the day, they remain cool by staying in the water or mud; reproduction and childbirth both occur in water. They emerge at dusk to graze on grasses. While hippopotamuses rest near each other in the water, grazing is a solitary activity and hippos are not territorial on land.
1. yes, we are students.
2. we are students.
3.yes, we are reading.
4.we are reading.
5. I am opening the book.
6. I am writing.
7. yes, he does.
8. my friend is Ann.
9. This man is teacher.
10.These man is engineer.
My family is very big. I have grandmother,grandfather, father,mother . I am the only child in our family.
My father is a doctor. His name is Alex. My mother is a teacher. Her name is Helen. I am a pupil.
Our family is very happy. Because my parents live friendly.
<span>Doctor: "I called at the Sterns' house at nine-fifteen. I was rather later than I had planned to be because I visited another patient. When Mrs Stern let me into the house she seemed rather embarrassed and showed me into the sitting-room. I could hear Trevor Stern was shouting at someone in his study. Mrs Stern said something about teenage girls and that they had problems with Lucy. Well, the shouting stopped almost immediately, so I went to his study. Lucy had already left the room before I got there. I tried to explain to Trevor why he needed to have these hospital tests, but he did not let me. He said I was an ignorant country doctor who did not know what he was talking about. I realised it was no use arguing with him so I left after only a few minutes. I was quite angry actually. I let myself out of the house without seeing Lucy or Mrs Stern."</span>
<span>Gerald: "Yes, Trevor was my business partner. We were not really friends. Yes, my house is just around the corner from the Sterns'. I have been living here for two years now. I have a little cottage in the village. But I bought this house when I started to earn a lot of money.</span>
<span>I can't really tell you very much about the night Trevor died. I took my dog for a long walk that evening. I went up on the hills, away from the village. Then the stupid dog went after a rabbit or something and I lost im in the dark. I was looking for him when I met Lucy, as a matter of fact. She was walking up the road towards their house. She seemed rather upset. I asked her if she had seen the dog, but she said she did not have. She went into her house and I found him a few minutes afterwards. I was back home by just after quarter to ten."</span>
<span>Detective Inspector Blackledge showed the statements to her colleague, Sergeant Ross.</span>
<span>Blackledge: "Well, Ross. What do you think? Who killed Stern?"</span>
<span>Ross: "I don't know. It was not his wife. She did not even go into the study."</span>
<span>Blackledge: "But she admits she didn't love him. Do you think she's in love with the doctor?"</span>
<span>Ross: "It's possible. And perhaps Trevor Stern found out. But we know the doctor was at the hospital by ten o'clock that night. And that's at least half an hour from the Sterns' house."</span>
<span>Blackledge: "But that means he left the Sterns' house before half past nine."</span>
<span>Ross: "Exactly."</span>
<span>Blackledge: "Anyway, Dorothy Stern told her sister she would leave her husband. She didn't need to murder him."</span>
<span>Ross: "But what about Lucy?"</span>
<span>Blackledge: "Yes, there's something about Lucy's story which . Let's see, what did Gerald Brook say?"</span>
<span>Ross: "That's it! Lucy went to the village and back if he saw her at twenty to ten. She was at be her father at nine-fifteen."</span>
<span>Blackledge: "But look at all the statements. The times do not quite fit."</span>
<span>Ross: "Neither do the facts. Someone told lies."</span>
<span>Blackledge: "I think it's time we make an arrest."</span>