You can also explore the dunes on foot, seeing some unusual and beautiful plants and flowers. Signs along the trail tell about the plants growing in the sand. You can even camp there overnight. But you must be careful. It is easy to get lost in the waves of moving sand especially during sandstorms. There is no water to drink. The temperature can rise to thirty eight degrees Celsius in summer. There is no shelter from the sun's rays.

　　White Sands is part of America's National Parks System, and it is just one of the unusual examples of America's natural and cultural treasures.

　　16．Which of the following plays a major role in making for the extreme environment?

　　A．Plants and animals.

　　B．Strong winds.

　　C．Intense heat and little rain.

　　D．Many people.

　　17．Walking on dunes, people will ________．

　　A．enjoy the beautiful sight of sand moving

　　B．see many kinds of white plants and animals

　　C．find out some special activities

　　D．get lost easily and quickly especially during storms

　　18．What do we know about White Sands from this passage?

　　A．It is one of the largest sand dune fields in the world.

　　B．You can get to know its natural history while driving in it.

　　C．The temperature here can rise to thirty­eight degrees Celsius any time.

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