45. Which work needs a lot of time to do?

　　A. To get rid of certain types of plants.

　　B. To carry the building materials.

　　C. To replace the stones.

　　D. To clean the stones.

　　B

　　The Internet is not perfect. There are many problems with it.

　　The Internet is not organized. There is no one in charge of the Internet. It is sometimes difficult to find what you are looking for. It is also easy to get the wrong information on the “Net”.

　　Some businessmen cheat people on the Internet. Internet thieves can steal credit card numbers. Some advertisers send spam to e-mail boxes. E-mail boxes are often filled with these unwanted advertisements.

　　Illegal(非法的) businesses can operate on the Internet. These businesses sell X-rated materials, cigarettes and alcohol to teenagers.

　　The Internet has websites with information about making bombs, breaking the law and terrorism.

　　Criminals can fool people, especially children, in chat rooms. They can spread poisonous information and attack new members.

　　The Internet is the greatest advance in communication since human emerged. But it can also like a dark alley in a dangerous part of town. Parents need to set parental controls on their children when they use the Internet. This will keep some of the bad material away from their children.

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