| 选择方框内所给的单词并用适当形式填空。 | |
see animals, but a small cage isn't a good place for an animal to live in. Today, zoos keep animals in 3______ kinds of cages. The cages are very big and 4______. The cages look like the 5______ habitats. Zoos help to protect animals, They protect animals in the zoo and they protect animals in the 6______. How do they do this? Zoos teach people how animals live in the wild. Zoos want people to help 7______ the "wild habitats". Many plants and animals are going extinct. 8______ say that seventy-four kinds of 9______ things go extinct every day! Zoos are working together to 10______ animals from going extinct. |
| 从方框中所给的选项中选出能填入空白处的最佳选项,补全短文,其中有一项为多余选项。 | |
| March 20th is World Water Day every year. According to a report from the United Nations, more than half of the world's major rivers have serious water loss and are polluted. The Yellow River, the world's fifth longest river, watered some of the oldest farms on earth. But now it has a serious problem. 1_______ In most of the past 35 years, it didn't reach the sea. The Nile in Egypt, running 6, 650 km, is the longest river in the world. 2_______ Now it is down to 2 billion m' or so. Australia's Murray River reaches the sea only every other year. One fifth of America's Rio Grande has no water, either. 3_______ Mostly it's damming (筑坝) and global warming that make rivers dry. 4_______ Now about 45, 000 of them lie across the world's rivers. They hold back around 15% of the world's fresh water from running to the sea. Global warming is making things worse. Warmer weather takes water away. The glacier (冰川) are becoming smaller. 5_______ Global warming has had certain effects on water sources (源头). Droughts (干旱) happening around the world make people pay more attention to this fact.
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