乡亲们我回来啦~~ 513广州一战 730，趁着还没昏倒赶快放狗！~

slamshady

呵呵。。。恭喜LZ！

踏雪无痕1989

地球大哥好厉害啊，我摩拳擦掌。。。。

goldwings

感谢楼上兄弟姐妹们！！！

燕姿加油！！！

goldwings

我先回家啦，马上没电了，晚上回家接着放哈。

晕晕晕。。。

nowwsy

沾个光来hiahia

nowwsy

这题？
14.再见sea otter
V1 from cytlc1978
sea otter那题，原题问weaken，我考的这道问support，题干略有变动，选项跟原题完全不同
V2 from xzbest
otter数量下降，与此同时seal数目上升。Seal是被killer-whale吃的。说whale数目增加，又说seal怎样怎样，所以说otter是被whale吃了。问啥忘了。。
V3 from qq309790244
kill whale：seaotter数量减少。report说sealion 和seal也下降，killwhale吃sealion和seal，但是报告说killwhale吃seaotter   is rare，但在1980前根本没有报告。所以seaotter下降是由于killwhale。问支持
GWD原题：
GWD-8-Q3:
In the late 1980’s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution-related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably.
Which of the following, if true, most seriously weakens the reasoning?
Killer whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey.
There is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980’s.  
Along the Pacific coast of North America in the 1980’s, sea otters were absent from many locations where they had been relatively common in former times.
Following the decline in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters’ main food source.
The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.

Babee2queen: Sea otter在六月机经里出现过加强的版本：
C）seals and sea lions的食物大量减少，但是sea otters的prey没有减少（正确答案）
e) 在kill whale到不了的bay的sea otters数量和kill whale到的了的数量都减少了。

Babee2queen: 从V2V3来看，和GWD原题差异比较大；大家认为C的答案很靠谱，排除他因

冰蔷薇

先来gxlz

wxq19881113

恭喜LZ好成绩！。。

wini123

恭喜恭喜啦~~

忽然忘了解脱

啊哈~~~金翅膀~~~~

恭喜恭喜~~~~

CONG~~~~