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中等难度试题的区分度比较高，难度为0．5的题目，区分度最大。（）
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中等难度试题的区分度比较高，难度为0．5的题目，区分度最大。（）此题为判断题(对，错)。请帮忙给出正确答案和分析，谢谢！
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A）阅读短文,选择正确答案There is an old tiger in the forest. He doesn’t want to look for food now. He often asks other animals to get him something to eat.
One day, he sees a monkey and says, “I am hungry, monkey. Go to the village and get me something to eat.” “ I can’t do that now, tiger,” the monkey says, “There is another tiger over there. He will not let me get anything for you to eat. I am afraid of him.” “What?” cries the old tiger. “Take me to that tiger. I will talk to him.”
The monkey and the tiger get to the bridge over the river. “Now look down at the water.” Says the monkey. “Do you see the tiger?” “Yes, I do,” cries the old tiger. “I will eat him.” With these words, the tiger jumps into the river.(
An old tiger lives ____.
A. in the zoo
B. in the garden
C. in the forest
D. on the farm(
How many tigers and monkeys are there in the story?
A. Two tigers and two monkeys.
B. Two tigers and one monkey.
C. One tiger and two monkeys.
D. One tiger and one monkey.(
)3 Why does the tiger ask the other animals to get him food?Because ____.
A. they are afraid of him
B. only they can look for some food
C. they are his friends
D. they like to do so(
The monkey ____.
A. goes to get something to eat
B. gets to the bridge with the tiger
C. knows there is another tiger
D. tells the tiger to jump into the water(
Which of the following is right?
A. The tiger is very clever.
B. The monkey eats the tiger.
C. The tiger eats another tiger.
D. The tiger jumps into the water. （B）吉姆正在和莎莉聊天.请根据聊天内容判断所给句子的对（A）错（B）Jim:
How many days are there in a week?Sally:
Why, seven, of course. Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday?Jim:
Well, Sally, can you speak out (说出) the five days of a week and not say Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday?Sally:
Let me see. I’m sorry I can’t. Can you?Jim:
Of course I can. They are today, tomorrow, the day after tomorrow, yesterday, the day before yesterday.(
) 6 There are seven days in a week.(
) 7 Sally can speak out five days of the week and not say Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday.(
) 8 Jim thinks there are five days in a week.(
) 9 It’s Saturday today, so tomorrow is Sunday.(
) 10 Tomorrow is the day before today. The world itself is becoming much smaller by using modern traffic and modern communication means（通讯设备）. Life today is much easier than it was hundreds of years ago, but it has brought new problems.
One of the biggest is pollution.
To pollute means to make things dirty.
Pollution comes in many ways.
We see it, smell it, drink it and even hear it.
Man has been polluting the earth.
The more people there are, the more pollution there will be.
Many years ago, the pollution was not so serious because there were not so many people. Man is now slowly polluting the whole world.
Air pollution is still the most serious. It's bad for all the living things in the world, but it is not the only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.
The pollution of SO2 is now the most dangerous kind of pollution. It is caused by heavy traffic. It is sure that if there are fewer people driving, there will be less pollution.
Many countries are making rules to fight(同……作斗争) pollution. They stop people from burning coal(烧煤) in houses and factories in the city. Dirty water is not allowed to go into rivers, lakes, seas and oceans.
The earth is our home. We must take good care of it.
根据短文内容,选择正确答案,将其代号填入左边括号内.1. Our world is becoming much smaller because _______ . A. the earth is polluted B. of the development(发展) of science and technology C. of the growth(增长) in population D. earth is blown away by the wind every year2. Many years ago, life was _______ it is today. A. much easier than
B. as easy as C. as hard as
D. much harder than3. The underlined(下划线的) word “it” at the end of the first paragraph(段落) means _______ . A. water pollution
B. air pollution C. noise pollution
D. all kinds of pollution4. Why is air pollution the most serious kind of pollution? Because it _______ . A. is bad for all the living things in the world B. makes much more noise C. makes our rivers and lakes dirty D. makes us angry more easily5. Which of the following is not true? A. Many countries are making rules to fight pollution. B. The problem isn't so serious because there aren't so many people living on the earth. C. The population of the earth is growing. D. If people could go to work on foot or by bike instead of motorbike or car, it would be helpful in fighting against the problem of SO2. (Keys:1?D5 BDCAB)二Pollution
The world itself is becoming much smaller by using modern traffic and modern communication means（通讯设备）.
today is much easier than it was hundreds of years ago,
but it has brought new
One of the biggest is pollution.
To pollute means to make things dirty.
Pollution comes in many ways.
We see it,
drink it and even hear it.
Man has been polluting the earth.
the more pollution.
Many years ago,
the pollution was not so serious
there were not so many people.
When the land was used up or the river was dirty in one place,
to another place.
But this is no longer true.
Man is now slowly polluting the whole world.
Air pollution is now the most serious.
for all living things in the world,
but it is not the only one kind of pollution.
Water pollution
our fish and pollutes our drinking water.
Noise pollution makes us
more easily.
Many countries are making rules to fight pollution.
people from burning coal（煤）in houses and factories in the city,
and from putting dirty
11 into the air.
Pollution by SO2 is now the most
kind of air pollution.
It is caused by heavy traffic.
It is true that if there are fewer people
there will be less air pollution.
The earth is our home.
We must take care of it.
That means
water and air clean.
And we must take care of the
in pollution at the same time.1. A.
Meeting2. A.
difficulties
problems3. A.
stranger 5. A.
arrived7. A.
possible8. A.
kills9. A.
start11. A.
smoke12. A.
interesting D.
popular13. A.
dancing14. A.
increasing
making15. A.
information
rise(Keys:1?D 5
CDABB 6?D10 CADBC
11?D15 DAACD)答案：1-5
ABBAB 累死我了,你看行吗O(∩_∩)O
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&&& 中环杯　
&&& 简介：中环杯全称&上海中环杯数学思维能力竞赛&，是一项难度比较高的思维能力竞赛。：中环杯是一项难度较大的中小学数学竞赛，在江浙和上海受到广泛认可。历年的中环杯一、二等奖获得者，绝大部分在小升初时都被重点中学实验班录取。中环杯分为初赛和复赛两个阶段，初赛主要考察奥数水平，复赛考察动手能力和思维能力等综合实力。适合小学3-6年级、初中1-2年级的在校学生。
　　考试时间：12月左右选拔赛；次年3月中旬进行决赛。
　　参赛内容：60％可参考《青少年科技报》的思维能力训练活动版面、历届思维能力训练活动各阶段的活动内容，以及本次活动的模拟训练内容，以上部分内容已收录进本届活动的配套辅导资料&&《青少年科技报思维能力训练活动内容汇编》中，40％为动手动脑实践内容。
　　常考点及备考策略
　　以第十二届中环杯考点分析为例
　　第十二届&中环杯&六年级初赛考点分析
　　整体来说，难度中等，动手动脑部分比较简单，填空题里有几道题目还是很具有区分度的，初赛是一个简单的筛选，主要看中计算能力及灵活应变.
　　填空1：简单的比较平均数大小的问题.（计算模块，难度★）
　　填空2：除法中的估算问题，数字很大，通过缩放估算.（计算模块，难度★★★★）
　　填空3：多边形的角度和问题.（几何模块，难度★★★）
　　填空4：分数比较大小.（计算模块，难度★★）
　　填空5：数三角形个数，推荐擦点法，就很简单了.（几何计数模块，难度★★★）
　　填空6：排列组合与最不利原则.（计数模块，难度★★）
　　填空7：简单的分数、小数混合运算.（计算模块，难度★）
　　填空8：考察圆的面积计算公式.（几何模块，难度★★）
　　动手动脑1：行程问题中的环形跑道追及问题，考查&路程差=速度差&时间&但是还要有一个检验的过程在里面.（行程模块，难度★★★）
　　动手动脑2：路径走法中的计数问题，建议采用标数法.（计数模块，难度★★★）
　　动手动脑3：题目以买奶茶的形式考查学生对枚举和不定方程的掌握情况，题目比较简单，想得全面周密即可.（不定方程模块，难度★★）
　　动手动脑4：魔方的旋转操作，考查学生对立体几何变换的空间想象及逻辑分析能力。（何模块，难度★★★★）
　　点评参考：图形变换历来是中环杯的压轴题，此题在《青少年科技报》中出现过。这次考查的内容是立方体的面旋转操作问题，需要学生具有一定的空间想象及逻辑分析能力。
　　第十二届&中环杯&五级初赛考点分析
　　一、填空题
　　1.定义新运算：难度系数★★
　　2.整除、最值：难度系数★★
　　3.抽屉原理：难度系数★★★★
　　4.排列组合：难度系数★★★
　　5.立体几何：难度系数★★★
　　6.统筹最优方案：难度系数★★
　　7.时钟问题：难度系数★★★
　　8.找规律：难度系数★★★
　　二、动手动脑题
　　1.行程问题：环形跑道（难度系数★★★）
　　2.平面几何：等积变换（难度系数★★★）
　　3.染色问题：黑白间隔染色（难度系数★★★★）
　　4.立体几何：空间想象、旋转（难度系数★★★★）
　　点评参考：第12届的中环杯五年级初赛题目，总体来说稍有些难度。其中填空第3题难度大些，考察到了计数问题，三大原理之一的抽屉原理。动手动脑的第1题考察学生分析问题的全面性，把每种情况都要考虑到；第3、4题难度稍大些，其中第3题考察学生的动脑、设计方案问题，第4题考察的是空间想象能力，还有理解题意的能力。总的来说难度较大。
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