everyday , so much litter and waste are poured out from

　　houses ,also pollute the environment ).

　　the significance for (controlling pollution ) noted that it's high

　　time that more effective measures should be taken .

　　therefore ,(new laws should be passed to limit the amount of pollutants

　　from factories . moreover ,in the households ,there is an obvious need

　　to reduce litter and waste . let's make our good efforts ,and the world

　　will be a safer place to live for us ).

　　（i）说明原因型

　　模块（5）

　　these days we often hear that ( 1 ).

　　it is common that ( 2 ).

　　why does such circumstance occur in spite of social

　　protects? for one thing ,( 3 ).

　　for another,( 4 ). what is more,

　　since ( 5 ),it is natural that ( 6 ).

　　to solve the problem is not easy at all ,but is worth

　　trying .we should do something such as ( 7 )

　　to improve he present situation ,and i do believe e

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