题干
It's time to watch "Where Are We Going, Dad?" Let's _______ the TV and watch it.
A：open
B：close
C：turn on
D：turn off
答案(点此获取答案解析）
C
It's time to watch "Where Are We Going, Dad?" Let's _______ the TV and watch it.
A：open
B：close
C：turn on
D：turn off
的通项公式
，若使得
取得最小值，n=" " （ ）
