1．Imagine the following scene：on the grasslands，an elephant stands under an umbrella-like tree．（75）B shadow（影子） grows long and thin．In the distance，you can also see a few zebras running here and there．Such a scene is commonplace in the magical continent of Africa．
Africa is the second largest continent in the world．To its southeast （76）A the Indian Ocean，and toward the west is the Atlantic Ocean．It is also the continent with the world's second largest population （more than 1billion） behind Asia．
The continent is （77）C to the world's tallest animal，giraffes．People can also find crocodiles （鳄鱼） and hippos （河马） in grassland and rainforests．
Africa is great to visit．In east Africa，Mount Kilimanjaro stands 5，895meters into the sky．It is the highest point in the continent．（78）B it lies in the tropics （热带），it is covered with ice and snow year-round．
The continent （79）D its hundreds of ethnic （种族） groups．The three largest ethnic groups are the Hausa，Igbo and Yoruba．They are all in west Africa．
Although many places in Africa are poor，this is not the whole picture．South Africa is the （80）C country in Africa．Some parts of the country are wealthy．Modern and well-developed roads are common everywhere．You can also spend a day in a large shopping mall or taste delicious seafood in a restaurant．
| 75．A．It's | B．Its | C．Their | D．His |
| 76．A．lies | B．faces | C．stands | D．has |
| 77．A．space | B．area | C．home | D．nest |
| 78．A．Since | B．Though | C．While | D．Because |
| 79．A．is proud of | B．is interested in | C．is made of | D．is famous for |
| 80．A．oldest | B．biggest | C．richest | D．poorest |
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