EA rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃．Rainforests have a great effect on the world environment because they can take in heat from t
题目
E
A rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃．Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate．Without the forest cover，these areas would reflect more heat into the atmosphere，warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns，potentially causing certain natural disasters all over the world．
In the past hundred years，humans have begun destroying rainforests in search of three major resources(资源)：land for crops，wood for paper and other products，land for raising farm animals．This action affects the environment as a whole．For example，a lot of carbon dioxide (二氧化碳)in the air comes from burning the rainforests．People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.
There are two main reasons for this．Firstly，when people cut down trees，generally they can only use the land for a year or two．Secondly，cutting large sections of rainforests may provide a good supply of wood right now，but in the long run it actually reduces the world’s wood supply．
Rainforests are often called the world’s drug store．More than 25％ of the medicines we use today come from plants in rainforests．However，fewer than l％of rainforest plants have been examined for their medical value．It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests．
72．Rainforests can help to adjust the climate because they ．
A．reflect more heat into the atmosphere
B．bring about high rainfall throughout the world
C．rarely cause the temperature to drop lower than l6℃
D．reduce the effect of heat from the sun on the earth
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第1题：
You should have blended the butter with the sugar thoroughly before you heated them.A:spread
B:mixed
C:beaten
D:covered答案：B解析：本题考查的是对动词的认知。这句话的意思是：在加热前，你应该把黄油和糖充分混合。blend的意思是混合。例如：Blend the flour with the milk to make a smooth paste．把面粉和牛奶调成均匀的面糊。 A.spread伸开；B.mixed混合，例如：It mixes easily with cold or hot water to make a tasty , filling drink．它极易溶于冷水或热水，冲成既可口又充饥的饮料：C.beaten击打：D.covered覆盖。blend和mix意思最接近，所以选B。 -
第2题：
若要实现total=1+2+3+4+5求和,以下程序段错误的是（）
A．int i=1,total=1; while(i＜5) { total+=i; i+=1; }
B．int i=1,total=0; while(i＜=5) { total+=i; i+=1; }
C．int i=0,total=0; while(i＜5) { i+=1; total+=i; }
D．int i=0,total=0; while(i＜=5) { total+=i; i+=1; }
A -
第3题：
要查看stats包中的数据集trees的前10行数据的命令是
A．trees(1:10)
B．trees(1:10,)
C．trees[1:10]
D．trees[1:10,]
trees -
第4题：
The path in the park looked beautiful，( )with( )leaves.A.covered；falling
B.covered；fallen
C.covering；falling
D.covering；fallen答案：B解析：考查非谓语动词。动词cover的逻辑主语为The path，二者为动宾关系，即The path is covered with ...故第一个空填covered，排除C、D两项。falling 表主动、进行或原因、条件等，fallen 表被动或完成状态。通过分析可知，覆盖在小路上的应为“已经掉落的叶子”，故fallen更符合句意。故本题选B。句意：公园里的小路看起来很漂亮，满是落叶。 -
第5题：
34、若要实现total=1+2+3+4+5求和,以下程序段错误的是（）
A．int i=1,total=1; while(i＜5) { total+=i; i+=1; }
B．int i=1,total=0; while(i＜=5) { total+=i; i+=1; }
C．int i=0,total=0; while(i＜5) { i+=1; total+=i; }
D．int i=0,total=0; while(i＜=5) { total+=i; i+=1; }
A -
第6题：
要查看stats包中的数据集trees的某一列数据，比如仅查看Girth列的命令是
A．trees$Girth
B．trees[Girth]
C．trees(Girth)
D．trees.Girth
trees