问题详情：
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。所有单词在填入前不需进行词形转换，每个单词只能用一次，每空只能写一词。
throw important save effort clean |
Water is very 1 to man, we can’t live without water. The 2 water is less and less. But some people don’t care about it. They waste a lot of water in their daily life. Even worse, they 3 rubbish into rivers. Many rivers and lakes are polluted. I think we have to 4 every drop of ’s also a good idea to encourage my friends and family members to join me! I believe if everyone makes a little 5, we can make a big difference.
【回答】
1. important 2. clean 3. throw 4. save 5. effort
知识点：选词填空
题型：阅读填空
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