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Passage 4
There is little rain in deserts. Because deserts are so dry, they have no "quilt" to help stop the soil from blowing away. As a result, they may get very hot during the day with the sun shining, but don't hold the heat overnight. Many deserts can quickly get cold once the sun goes down. Some deserts can reach temperatures of over $37\ °\mathrm{C}$ during the day and then drop below freezing at night.
The largest hot and dry desert in the world is the Sahara in Northern Africa. The Sahara is a sandy desert with great sand dunes（沙丘）. It covers over 3 million square miles of Africa. Other large deserts include the Arabian Desert, the Gobi Desert, and the Kalahari Desert.
Animals that live in the desert are also used to needing little water. Many get all the water they need from the food they eat. $\boldsymbol{\Delta}$ The camel stores up fat in its hump while other animals keep something they need in their tails.
Only certain types of plants can live in the terrible environment of the desert. You won't see a lot of tall trees in the desert. Most plants have a way to keep water in their leaves or
There is little rain in deserts. Because deserts are so dry, they have no "quilt" to help stop the soil from blowing away. As a result, they may get very hot during the day with the sun shining, but don't hold the heat overnight. Many deserts can quickly get cold once the sun goes down. Some deserts can reach temperatures of over $37\ °\mathrm{C}$ during the day and then drop below freezing at night.
The largest hot and dry desert in the world is the Sahara in Northern Africa. The Sahara is a sandy desert with great sand dunes（沙丘）. It covers over 3 million square miles of Africa. Other large deserts include the Arabian Desert, the Gobi Desert, and the Kalahari Desert.
Animals that live in the desert are also used to needing little water. Many get all the water they need from the food they eat. $\boldsymbol{\Delta}$ The camel stores up fat in its hump while other animals keep something they need in their tails.
Only certain types of plants can live in the terrible environment of the desert. You won't see a lot of tall trees in the desert. Most plants have a way to keep water in their leaves or
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