A desert is defined as a place that gets less than 250 mm of rain each year. It differs sharply from the climate of a rain forest, A _________________.
Arid desert lands cover about one third of the earth’s surface. Most deserts are covered with sand, B __________________. There are also usually a lot of rocky areas. This combination of sand and rock means that the soil is not very fertile. C ___________________, some living things are able to do well in this setting. Many plants have changed and developed in ways D ________________. These changes have become apparent in a number of ways. Some plants are able to grow very quickly E ______________. They turn green and produce flowers within just a few days. Other desert plants simply stop growing in very dry weather. They appear to be dead, but when the rain returns, they come back to life and begin growing again.
Desert animals have also developed many characteristics that help them to survive in arid environment. Camels can go for a very long time without drinking. Other animals, such as snakes and rats, find cool places to sleep during the day and come out only at night. The extremely long ears of desert rabbits help them F ________________. Changes like these have allowed some animals and plants to grow and develop successfully in a very challenging ecological system: the desert.
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1. which is often in the form of hills called sand dunes
2. whenever it rains
3. to find water as far as 25 metres away
4. which can receive up to 10,000 mm of rain annually
5. to better distribute their body heat and stay cool
6. even though the desert environment is very dry and hot
7. that help them to live in the desert
| Ответ: | A | B | C | D | E | F |
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