做错原因是没看清楚题目。题目说是mid-1700s。我以为是1700年，实际上就是看1750那一段。Fewer otters would have allowed sea urchin populations on which the otters preyed to expand and the urchins’ grazing pressure on kelp forests to increase. Otter 变少了，所以urchin就会变多。
Downright 明白的，直率的，显明的；完全，彻底，全然 Disruptive 破坏的，分裂性的，制造混乱的
出错原因是没理解downright disruptive。是很严重的后果。所以前面让步应该是不严重的意思。选modest温和的 unremarkable不显著的
footage 连续镜头
？？？没看懂这题是啥意思
Regulation 管理，规则，校准 Procedure 程序，手续，步骤
？？为什么不能选regulation
Fragmented audience are unlikely to consume a common diet of news, potentially leaving them underinformed about central issues facing a nation.
As Kats has argued…
40*0.5=20 50*0.9=45 25/45=0.555