问题 解答题

在节能减排活动中,实验小学的“环保小卫士”共回收800千克废纸,据了解,废纸的不可再生率是20%,回收的这些废纸能生产多少千克再生纸?

答案

800×(1-20%),

=800×80%,

=640(千克);

答:回收的这些废纸能生产640千克再生纸.

选择题
填空题

Read the passage and fill in the blanks with proper words. (在短文的空格内填入适当的词,使其内容通顺,每空格限填一词,首字母已给。)

      Many people use the Internet to get useful knowledge and facts, and to relax themselves. But some of

them are not using it in a good way. Here are some rules to make sure you are s           and have fun on the

Internet.? 

       ●Make rules for the Internet use with your parents. For example, when and how long you can go

          online, and what activities you can do online.? 

       ●Don't give your password to anyone else, and never give out the following i          : your real name,

           home address, age, school, phone number, etc.? 

       ●Check with your parents before giving out a credit (信用) card number. 

       ●Never send a photo of yourself to anyone in an e-mail u           your parents say it's OK. 

       ●Check with your parents before going into a chat room. Different chat rooms have different rules

           and attract different kinds of people. You and your parents must make sure it's a r           place for

           chatting.

       ●Never agree to meet someone you meet on the Internet w           your parents'permission (允许).

           Never meet anyone you meet online a          .  

       ●Always remember that people online may not be the people they say they are. Treat (视为) everyone

           online as if they were strangers. 

       ●If something you see or read online makes you uncomfortable, l           the site. Tell your parents or

           your teachers at once. 

       ●Treat other people as you'd like to be treated. Never use bad language. 

       ●Remember---not everything you read on the Internet is true.