题目内容
One of the world's great natural wonders is in New Mexico, in the southwest of America. Nature has created huge moving hills of pure white sand. These sand dunes cover more than seventythousand hectares of desert.
It is one of the largest sand dune fields in the United States. The bright white sand dunes are always changing，always moving, like waves on the ocean.Driven by strong winds, the sand moves and covers everything in its path. It is like a huge sea of sand.
You may wonder how anything can live in this extreme environment of a white sand desert. There is not much rain.The heat in summer is intense. The sand lacks nutrients.Plants and animals struggle to survive. A few kinds of plants grow quickly to survive burial by the moving sand dunes. Several kinds of small animals have become white in color in order to hide in the sand.
More than five hundred thousand people visit White Sands each year. They climb on the dunes and observe the moving sea of sand.
White Sands is about twenty four kilometers southeast of the city of Alamogordo, New Mexico. In the visitor center at the entrance of the park, you can find out special activities and guided walks. You can drive about thirteen kilometers into the center of the dunes. It is like driving on a lonely white planet.Along the way there is information that tells about the natural history of White Sands.
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.
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.
美国新墨西哥的白沙是世界自然奇观，以其极端的环境和独特的沙丘吸引着四面八方的游客。
16．C 细节理解题。根据第三段前三句的内容可知形成这种极端环境的最主要的因素是酷热和少雨。
17．A 细节理解题。根据第二段第二句以及倒数第二段第一句的内容可知，走在沙丘上人们可以欣赏沙丘移动的美景。
18．B 细节理解题。根据第五段的内容可知开车在白色沙丘上行驶时，你可以了解它的自然历史。
19．A 写作目的题。文章第一段是概述，叙述了美国新墨西哥州的白沙这一世界自然奇观，下文则是更为详细的介绍，所以文章意在吸引游客游览这个地方。
