题目

根据短文内容，从方框中选择恰当的单词，并用其适当形式填空。 plant   hundred   possible   sky   danger   pollute   sea   environment   rocket   easy     What was life like of years ago? Let me tell you. There were no machines then. People did things by hand. Of course, there were no , either. It was for people to go into space. But the was a lot better. People could enjoy the blue , white clouds and clean water.     Life today is much because of the invention (发明) of machines. But it has some new problems. One of the biggest problems is. . For example, rivers, lakes and the are polluted by factory sewage (污水). It's for people to drink the water.      Luckily, people have realized (意识到) these problems and they're' doing something to solve them. They more trees. They go out by bike or on foot. 答案：【1】hundreds【2】rockets【3】impossible【4】environment【5】sky【6】easier【7】pollution【8】sea【9】dangerous【10】plant

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