Unit 4 Section Ⅰ
Ⅰ.单词拼写
1．The solar __system__(系统)was formed 4.5 billion years ago.
2．There are many __theories__(理论)about the origin of life.
3．The __violent__(猛烈的)winds buried the village in sand.
4．Changes in the climate are due to pollution of the __atmosphere__(大气)．
5．__Unlike__(不像)my sister，I am a terrible cook.
6．The __fundamental__(基本的)cause of his success is his hard work.
7．It's __harmful__(有害的)to your eyes to read in the bus.
8．She wore a silver __chain__(链条)around her neck.
