56．The earliest frogs lived about ________ million years ago.

　　A. 20

　　B. 30

　　C. 50

　　D. 190

　　57．The Gold Frog is one of the ________ frogs on the earth.

　　A. smallest

　　B. biggest

　　C. strongest

　　D. weakest

　　58．________ can jump over 2m.

　　A. The Goliath Frog

　　B. The Common Wood Frog

　　C. The Poison Frog

　　D. The Australian Rocket Frog

　　59．What will happen to a Common Wood Frog at very low temperature?

　　A.It will die very soon.

　　B. It will be an ice frog.

　　C.It will become dangerous.

　　D. It will become very small

　　B

　　Perhaps you have heard a lot about the Internet, but what is it, do you know? The Internet is a network. It uses the telephone to join millions of computers together around the world.

　　Maybe that doesn’t sound very interesting. But when you’ve joined to the Internet, there are lots and lots of things you can do. You can send E-mails to your friends, and they can get them in a few seconds. You can also do with all kinds of information on the World Wide Web (WWW).

　　There are many different kinds of computers now. They all can be joined to the Internet. Most of them are small machines sitting on people’s desks at home, but there are still many others in schools, offices or large companies. These computers are owned by people and companies, but no one really owns the Internet itself.

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