The video owner has disabled playback on external websites.
This video is no longer available on YouTube.
This video cannot be played right now.
Watch on YouTube
B1 中级
英语
12:33
Educational
Genes, DNA & chromosomes | Heredity & Evolution | Biology | Khan Academy
学习统计
B1
CEFR 等级
5/10
难度
评论 (0)
登录后评论
还没有评论。成为第一个分享想法的人！
互动模式
测验
正确！
不太对。
正确答案：
相关视频
One of the Greatest Speeches Ever | Steve Jobs
10:31
Dwight's Slackline Fail - The Office
B1
3:38
Witness to Steve Irwin's Death - Smarter Every Day116
B1
7:46
The Most Dangerous Stuff in the Universe - Strange Stars Explained
B1
7:10
WATCH THIS EVERYDAY AND CHANGE YOUR LIFE - Denzel Washington Motivational Speech
B1
10:06
Khan Academy India - English
测验
正确！
不太对。
正确答案：
观看视频时会出现测验
记忆技巧
来自此视频
免费开始学语言
