应用: 今日头条
任务: 启动今日头条，进入首页，搜索‘科技新闻’
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: TYPE
type_text: 科技新闻
step_id: 3
action: CLICK
step_id: 4
action: STOP