Recent research from
the Pew Internet Project suggests that 90% of Americans aged from 12 to 17 use
the Internet, and 51% of those teens use social networks. However, there are
many possible problems with social networking
sites and the teenagers who use them.
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.
1.How many dangers of using social networks are mentioned in the passage?
A. 2. B. 3. C. 4. D. 5.
2.The writer takes MySpace as an example to show that ________.
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
3.We can infer from the passage that ________.
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
Cooking and Learning
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.
 |
 |
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
2. ________ has over sixty pages.
A. Fun with Food B. Kids Cooking Lessons E-Book
C. Food Facts E-Book D. Kids Food Science Experiments
3.Kids Cooking Lessons E-Book is popular because ________.
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
Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
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."
1. Whom did the three kids want to challenge?
A. Their chemistry teacher. B. Their headmaster.
C. Robert Boyle D. Thomas Edison
2. From the text, a red cabbage is a kind of ____.
A. plant B. animal C. paper D. liquid
3.What is widely used as the acid-base indicator now?
A. red cabbage B. litmus paper
C. any plant D. any flower
4.The story mainly tells us ____.
A. how to make litmus paper B. about the three kids' spirit
C. scientists were wrong D. the kids are heroes
We sometimes call the lion “the king of the jungle (丛林)” because it is stronger and more dangerous than other animals. It can run faster than many animals and it can hunt (捕猎) the best. It is the highest animal in the 21 food chain (食物链).[
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!
1.A. land B. sea C. mountain D. desert
2.A. front B. end C. top D. beginning
3.A. People B. Lions C. Sharks D. Cheetahs
4.A. strongest B. cleverest
C. most special D. most important
5.A. used B. had C. made D. invented
6.A. fight B. escape C. kill D. catch
7.A. hotels B. schools C. factories D. hospitals
8.A. great B. terrible C. wonderful D. complete
9.A. one part B. another part C. other parts D. the other parts
10.A. ourself B. yourselves C. themselves D. ourselves
_________ it is! Thank you very much!
A. What valuable advice B. What a valuable advice
C. How good a suggestion D. How good advice
With the help of the computer, information can ______ every corner of the world very quickly.
A. get B. reach C. arrive D. return
