21．―I will go to Qingdao for a visit with my family this summer holiday．

      A．So do I             B．So I do             C．So will I             D．So I will

20．Who should protect our environment?

    A．The old．          B．Our parents．        C．Every one of us．

19．Can plastic bags waste a lot of energy?

     A．Yes, they can．     B．No, they can' t．    C．We don' t know．

18．What can plastic bags pollute? 

      A．Only soil          B．Only water             C．Both soil and water

17．What are the plastic bags called?

    A．free baskets         B．"white" pollution  C．"white" baskets

16．What has China decided to do?

    A．Stop the use of free plastic bags．

    B．Begin the use of free plastic bags．

    C．Continue （继续） the use of free plastic bags．

14．How will they do with the garbage?

     A．They will throw it away．

    B．They can make it into glass and metal．

    C．They will sort it．

13．How does Brian get in touch with his e-pal （ 网友）?

    A．By e - mails．       B．By QQ．           C．By phone calls．

12．What are they talking about?

     A．They are talking about taking showers

    B．They are talking about saving water．

    C．They are talking about water．