Question

阅读理解 　　Probably you have seen photographs of the Grand Canyon(峡谷)，the great valley in the desert country of Arizona．But you must go there yourself to feel its true size and beauty．The Grand Canyon is one of the greatest natural wonders of the world． 　　The Colorado River formed the Grand Canyon over millions of years．Slowly, the river cut down through hard rock．At the same time, the land was rising．Today, the canyon is one and a half kilometres deep and 445 kilometres long．The oldest rocks at the bottom of the canyon are more than 1 billion years old．The width varies from about 200 metres to 29 kilometres across．The rim(边缘)or top of the canyon is about 2,300 metres above sea level on the South Rim, and about 3,000 metres on the other side, the North Rim．As a result, there are different kinds of plants and animals on opposite sides of the canyon．The South Rim is dry desert country．The North Rim has tall forests． 　　The canyon looks different at different times of day, and in different seasons and weather．At sunrise and sunset the red, gold, brown, and orange colours of the rocks are especially clear and bright．In winter, the canyon is partly covered with snow． 　　The view from the South Rim of the Grand Canyon is the best, Most visitors come to the South Rim and stay in campgrounds or hotels．Every point along the canyon's edge offers a different view． 　　The North Rim of the Canyon is quieter．It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River．On the way, you go through Navado Indian lands, and a colourful pink desert called“The Painted Desert”． 　　You can walk down into the Grand Canyon, or you can go down on the back of a mule(小型电动机车)．You can also take a boat trip down the Colorado River, and camp on the beaches at night．But whether you see the Grand Canyon from the top or the bottom, it will be an experience that you will never forget． (1) The sea level on both sides of the Grand Canyon is ________． [　　] A． the same B． changing with time C． various D． very low (2) From the passage we can know that the ________ of the canyon is different at different time． [　　] A． length B． scene C． width D． height (3) If you go to visit the canyon you'd better go to ________． [　　] A． the South Rim B． the North Rim C． the bottom D． the top of a tree

Answer 1

答案：1．C;2．B;3．A;
解析：

(1)	文中讲到：The rim or top of the canyon is about 2,300 metres above sea level on the South Rim, and about 3,000 metres on the other side, the North Rim．由此可见，大峡谷两边的海拔是不同的，故C项是正确的．
(2)	文章第三段首句意为：大峡谷在一天中的不同时间，不同的季节和天气里，看上去都是不一样的．由此可见，大峡谷的景象是多变的，在各个时期是不同的，故B项正确．
(3)	从第四段的首句：The view from the South Rim of the Grand Canyon is the best．可知：大峡谷南端的景象是最美的，若你要观光，最好到the South Rim，故A项为正确答案．