Most deserts have a surprising variety of life. There are plants, animals and insects that :have adapted to life in the desert. During the heat of the day, a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

　　5．Many plants may survive in deserts when__________________.

　　A. the rain is spread out in a year

　　B. the rain falls only in a few weeks

　　C. there is little rain in a year

　　D. it is dry all the year round

　　6．Sand dunes are formed when___________________.

　　A. sand piles up gradually

　　B. there is plenty of rain in a year

　　C. the sea has dried up over the years

　　D. pieces of rock get smaller

　　7．The underlined sentence in the third paragraph probably means that in a desert there is____________.

　　A. too much sand

　　B. more sand than before

　　C. nothing except sand

　　D. something else besides sand

　　8．It can be learned from the text that in a desert____________.

　　A. there is no rainfall throughout the year

　　B. life exists in rough conditions

　　C. all sand dunes are a few feet high

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