题目
题型：不详难度：来源：
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We’ve learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It’s hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!
"It’s our first scientific journey, Huang said, "But it makes me want to try harder."
小题1: Whom did the three kids want to challenge?
| A．Their chemistry teacher. | B．Their headmaster. |
| C．Robert Boyle | D．Thomas Edison |
| A．plant | B．animal | C．paper | D．liquid |
| A．red cabbage | B．litmus paper |
| C．any plant | D．any flower |
| A．how to make litmus paper | B．about the three kids’ spirit |
| C．scientists were wrong | D．the kids are heroes |
答案
小题1:C
小题1:A
小题1:B
小题1:B
解析
本文讲的是三个中学生入挑战世界闻名的科学家Robert Boyle使用石蕊纸的事，告诉我们做事要有一种坚持的精神。
1. C 答案来自于本句：British scientist Robert Boyle discovered the use of litmus paper over 300 years ago，属于对细节的理解，选C，其它几项未说到。
2. A 此题属于推理题，要联系上下文才能找到答案。从下文They went to collect over 40 plants in parks, gardens and markets可知是一种植物plant,故选A。
3. B 对细节题的考查。在Now it is used widely in experiments all over the world中的it指代的就是上方说到的litmus paper，故正确答案为B。
4. B 本题是个归纳总结题。文章从他们三个决定挑战到后面努力收集寻求的过程，说明他们三个的精神的可贵，这也是这篇文章的主旨所在，选B。
核心考点
试题【Three kids have been learning chemistry for only a few months. But they have alr】；主要考察你对科普环保类等知识点的理解。[详细]
举一反三
In the sea, the shark is one of the animals at the 22 of the food chain. It can swim faster than most other sea animals, and it can use its big teeth to eat them.
What is at the top of the world’s food chain? 23 are! We are not the biggest or fastest, but we are the 24 We could not run faster than cheetahs (猎豹), so we 25 cars and now we can move the fastest. We could not 26 better than lions, so we invented guns (枪). Now we can hunt the best.
People’s inventions are clever, but they can be dangerous, too. For example, people invented 27 , and now they make the air and rivers dirty. This can make 28 changes. Dirty rivers kill fish. Then bears cannot eat the fish and the bears die. If we kill one part of the food chain, 29 also die. Remember that we are a part of the food chain, so we are in danger too! If we protect animals, we are protecting 30 ! We should and we could do something for the world!
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In this E-book package, we have four e-books.
Fun with Food
This fun e-book is filled with
exercises --- photo tests, word exams, riddle games,
coloring pages and exercises
on learning more about food.
 |  |
小题1:Kids can ________ by reading Fun with Food.
| A．do science experiments | B．get cooking experience |
| C．cook well in the kitchen | D．play some riddle games |
| A．Fun with Food | B． Kids Cooking Lessons E-Book |
| C．Food Facts E-Book | D．Kids Food Science Experiments |
| A．there is a unit for each age group | B．there are a lot of photo tests in it |
| C．kids can learn more about science | D．each part is very easy to print off |
Apart from the social advantages, social networking sites can be used to record school research, develop artistic talents and experiment with other forms of subject creation. They provide a way to communicate with others who share the same interests and to get helpful advice on ongoing projects.
Along with these advantages come some dangers. For example, most social networking sites are open to all, especially MySpace, which is the most popular social network among teens in America. It means that they could be put in unpleasant and frightening situations.
A greater danger is that teens may become objects of the people with secret purposes. The secrecy of some social networking sites makes it easy for dangerous people to find young teens and invite them into dangerous conversations. It’s easy for them to pretend as teens and draw children into dangerous real-world communication as well. Then further hurt might be on its way.
Another danger is identity stealing, which can happen when teens share too much information about their names, dates of birth and locations.
Therefore, it’s very important to make sure teens are safe when they use social networks.
Many of the same rules that work for online chat work for these sites:
※Don’t use your real name.
※ Don’t give out personal information to people you don’t know. A last name and a town
are enough for a bad guy to find where you are.
※ Don’t believe that people are who they say to be.
※ Immediately end any communication that makes you uncomfortable and report it to a
parent.
Only if you are sure of your safety, can you enjoy the fun brought by social networking. Besides, trying to deal with all problems on your own can lead to terrible results. Remember, asking your parents or school officials for help doesn’t mean you are unable to do anything but wiser than many others.
小题1:How many dangers of using social networks are mentioned in the passage?
| A．2. | B．3. | C．4. | D．5. |
| A．students could be put into unreal situations on the Internet |
| B．teenagers are facing unknown dangers on the social networks |
| C．Internet provides more social websites to American teenagers |
| D．social networks are very popular among teenagers in America |
| A．the dangers are similar when chatting online and surfing social networks |
| B．more than half American teenagers aged from 12 to 17 use social networks |
| C．teens who ask for help are wiser when meeting problems on social networks |
| D．there are more disadvantages than advantages for teens to use social networks |
Once she was beautiful and rich, but now she becomes dirtier and dirtier, poorer and poorer. It is due to what we have done to her. Please have a good look at her: polluted rivers and lakes, growing deserts, the destruction of the forests and wild life, and the depletion (消耗，用尽) of the ozone layer (臭氧层)...
Can she bear to see her children putting the waste here and there? Can she bear to see her children cutting down the trees and destroying the grassland, to see the acid rain destroying everything? Can we bear to see our mother suffering (受苦) so much? Isn’t it time for us to ask ourselves whether this is the way to treat our mother?
Floods, droughts, acid rain..., these are the punishments (惩罚) from nature. Everyone should know that there is only one earth. If we go on treating her like this, it won’t be fit for us to live in any longer. It’s time for us to love her, take good care of her and cure her. We should save the earth so as to save ourselves.
小题1: What does the earth look like now?
| A．It has clean rivers, lakes and green forests. |
| B．It is like a beautiful girl. |
| C．It is more beautiful and richer. |
| D．It is dirtier and dirtier, poorer and poorer. |
| A．Know | B．Stand | C．Imagine | D．Hear |
| A．The earth—our mother. |
| B．Defenders of the Earth (地球卫士). |
| C．The earth is very beautiful and healthy. |
| D．The water on the earth is very clean. |
Voice of the students:
“Our parents hold too high expectations（期望）which put us under lots of pressure. They care too much about our lives and studies,” one student said.
“It’s impolite that some students’ parents read their children’s diaries without permission!” one student said angrily.
“Some of our teachers are so serious that we can’t make friends with them at all,” another student said sadly.
Voice of the parents:
One mother said, “After school, my daughter usually locks herself into her room and spends lots of time talking with others on the phone. And I can’t stand（忍受） her clothes and hairstyle!”
“I thought my son was doing very well in his studies. I didn’t realize I was being cheated by him until I got a call from his teacher,” said a father.
Voice of the teachers:
An English teacher said, “Today, the role of the teacher is to put knowledge into students’ brain. The power (权力) teachers have kept students away from them.”
“Some parents pay too much attention to their children’s grades instead of creating a lively and colorful environment at home,” another teacher said.
“In the past, teachers and students often played games together or talked with each other. Today, only studies and grades are talked about,” said a teacher. “A school should be a place where students can learn not only knowledge, but also how to face failure and frustration（挫折） bravely enough.”
小题1: What does the first paragraph mainly tell us?
| A．Students like telling how they feel to their classmates. |
| B．More and more students don’t like to be surveyed. |
| C．Some parents don’t like their children’s clothes and hairstyle. |
| D．There has been a great distance between students and parents as well as teachers. |
| A．欺骗 | B．批评 | C．表扬 | D．揭露 |
| A．Teachers feel what they are doing for students is good. |
| B．Parents, teachers and educational rules all influence students greatly. |
| C．Teachers should care more about excellent students. |
| D．Now teachers and students communicate better than before. |
| A．Unhappy Teenagers | B．Educational Rules |
| C．The Generation Gap | D．Serious Parents |
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