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【简答题】

Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive if the rain is spread throughout the year, If it falls, within one or two months and the rest of the year is dry, those plants may die and a dese rt may form. Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high. There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay beneath a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing –-very, very slowly ---as these forces of nature continue to work on the rock. 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. 68. Many plants may survive in deserts when__________________. A. the rain i s 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 69. Sand dunes are formed when___________________. A. sand piles up gradually             B. there is plenty of rain in a year C. the s ea has dried up over the years    D. pieces of rock get smaller 70. 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 71. 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              D. rocks are worn away only by wind and heat

题目标签:悬崖沙丘
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【单选题】E Around the world more and more people are taking part in erous sports and activities. Of course, there have always been people who have looked for adventures ——those who have climbed the highest...

A.
are trying activities such as bungee jumping
B.
are climbing the highest mountains
C.
are coming close to death in sports
D.
are looking for adventures such as traveling into unknown places

【单选题】前有悬崖,后有追兵

A.
双趋冲突
B.
双避冲突
C.
趋避冲突
D.
多重冲突
E.
双重趋避冲突

【多选题】悬崖式盆景制作要点:

A.
树干弯曲,垂于盆外
B.
悬崖枝设计造型有两种,苍龙探海和蛟龙回首
C.
树冠造型一定要和树势顺势
D.
悬崖枝再行时一定要有力度
相关题目:
【单选题】E Around the world more and more people are taking part in erous sports and activities. Of course, there have always been people who have looked for adventures ——those who have climbed the highest...
A.
are trying activities such as bungee jumping
B.
are climbing the highest mountains
C.
are coming close to death in sports
D.
are looking for adventures such as traveling into unknown places
【单选题】前有悬崖,后有追兵
A.
双趋冲突
B.
双避冲突
C.
趋避冲突
D.
多重冲突
E.
双重趋避冲突
【多选题】悬崖式盆景制作要点:
A.
树干弯曲,垂于盆外
B.
悬崖枝设计造型有两种,苍龙探海和蛟龙回首
C.
树冠造型一定要和树势顺势
D.
悬崖枝再行时一定要有力度