题目内容

5.There is apossibility (possible) of rain tonight.

分析 今晚有可能下雨.

解答 答案:possibility
此处用在不定冠词a之后,指的是:有…的可能(性);故用单数名词possiblity.

点评 做本题时,应结合句意,并从语法分析的角度去判断句中所填单词的形式;另外,在平时的学习中,应熟练掌握所学到的词汇以及各类词法,句法等语法知识.

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13.Trees are of great use to man in three important ways:they offer him wood and other useful things,they give him cool places,and they help to stop dr ought and flood.
In many parts of the world,unfortunatel y,man has not found that the third of these points is the most important.Man wants to make money from trees,so he has cut them down in large numbers,only to find that without them he has lost the best friends he had.And also,he is usually too careless to plant and look after new trees.So the forests slowly disappear.
This does not only mean that man will have fewer trees.The results are even worse:for where there are trees,their roots break up soil-make the rain in-and also b ind(粘合,凝结) the soil,thus stopping it from being washed away easily; but where there are no trees,the rain falls on hard ground and flows away,causing floods and carrying away the rich top-soil.When all the top-soil is gone,nothing is left but useless desert.
12.The most important points of trees to man isA.
A.they help him to stop drought and floods
B.they offer him cool places
C.they give him wood and other things
D.they help him to make money  
13.Which is not the reason for forests'slow disappearance in many places?
D
A.Many trees have been cut down by man.
B.New trees are not well looked after.
C.Less attention is paid to planting trees.
D.Global warming.
14.Land becomes desert after all trees are cut down becauseD.
A.roots of trees break up the soil   
B.there are too many rainfalls
C.strong winds bring a lot of sand
D.no more trees keep the rain and protect the top-soil.
15.Which title best fits the passage?B
A.Trees and Man                             
B.The Function of Tree Wood
C.How do People do with Trees?
D.The Usage of Tree Roots.
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