选词填空 根据短文内容，从方框中选择恰当的单词完成句子并填写在答题卡对应的横线上。部分单词在填入前需进行词形转换,每个单词只能用一次,每空只能写一词。
problem less important healthy recycle
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It is very ____ to deal with the rubbish in cities. This is because rubbish not only pollutes the environment but also does harm to people's ____ . We are trying to find some ways of dealing with the rubbish. First, the rubbish can be divided into different kinds. Newspaper and glass can be ____ . Used tins can be made into beautiful handicrafts（手工艺品）. Polluted water is a big ____ . It must be dealt with properly before we let it flow into the river. Some harmful rubbish can be buried（埋）so that it will cause ____ pollution.
