裁剪素材可以用的方法有（）
A. 把素材拖入到Timeline面板，使用鼠标拖移素材边缘
B. 在Program Monitor面板中，使用入点、出点按钮配合鼠标拖移时间线上的素材边缘
C. 在Timeline面板中使用Razor剃刀工具裁剪素材
D. 使用Clip菜单下的Speed/Duration窗口中的Duration进行设置
E. 把素材拖入Source Monitor面板，使用入点、出点按钮裁剪素材
The writer says that students today ____（）
A. are much more connected to life outside college
B. seldom ring their families
C. care more about their parents
D. spend a lot of time discussing literature and music with their college friends
Why did mothers record the incidents of empathy（）
A. They were taking part in some scientific research
B. They were interested in their children’s actions
C. They were students who were studying empathy
D. They thought it would help their children
The writer gives some practical hints for _____（）
A. accessing someone’s computer
B. preventing someone from stealing your identity
C. destroying documents
D. catching identity thieves
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