为对象设置透明度,对象必须在?
A: Video1A
B: Video1B
C: Video2
D: Video2以上的轨道
A: Video1A
B: Video1B
C: Video2
D: Video2以上的轨道
举一反三
- 认真看以上视频，依次在下方列出视频中出现的所有时间状语从句： Video 1: ______________________________________________________________________________________ Video 2: ______________________________________________________________________________________ Video 3: ______________________________________________________________________________________ Video 4: ______________________________________________________________________________________
- Quiz for Video2(副本) Watch the video again. Match each product with the reason that the student gives for liking its ad.
- Video 1: Video 1 mainly told us how to use chopsticks.
- 以下哪些轨道上不可以使用键控______。 A: Video1A B: Video2 C: Video3 D: Video4 E: Video1B
- ( )用于加入声音,( )用于加入视频。 A: <;audio>; <;video>; B: <;video>; <;audio>; C: <;audio>; <;audio>; D: <;video>; <;video>;