In the last part,i.e. Paragraph 4, the author restates his main idea, i.e. we should not just worry about the _______ peril but take the actions to eliminate it to create a safer world
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皮皮学刷刷变学霸
举一反三
【单选题】2 2 .W i n d o w s 是一个多任务操作系统,所谓“多任务”的含义是( ) 。