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.

　　D．You are not allowed to camp here overnight.

　　19．What is the main purpose of the passage?

　　A．To attract tourists to White Sands.

　　B．To describe the history of White Sands.

　　C．To introduce guided tours to White Sands.

　　D．To explain the power of nature at White Sands.

　　Ⅲ.阅读表达阅读下面短文并回答[1]How to protect child Web fans from unsuitable material online while encouraging them to use the Internet has long been discussed.

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