感觉E选项也有些牵强，A选项相比还好些，鲨鱼靠近海豚聚集的地方，然后吃掉海豚。而野外捕食的海豚，不那么聚集，所以鲨鱼也少，因而寿命长。

第一句是整个argument的观点，就是w可以根据寄主大小来精准产卵。后面是句子是support观点的，下的多，幼虫会竞争致死，下的少，幼虫会被腐烂致死。

a,句首的in holland让人感觉是在全句子的状语，所以和后面的in us并不平行

第二次做，对了
仔细看B，其实撇开other substance，B也不对，因为没有提到10年前跟十年后的区别

看了很多遍也不知道前面的architects and stonemasons是什么成分，原来同位语也可以放在前面～～

Both of two x重复

expect to do ,expect to do, expect to do重要事情说三遍～～～～错n多次了～～～

Line discus with lead用铅line铅球not用铅line重量

D
this usage creates a nonsense construction.
the reason that lindbergh refused... implies that lindbergh said "no" to a reason ("refused a reason"). that doesn't make sense.
Nobody knows the reason why xxxxx happens (worse)
Nobody knows why xxxxx happens (better)

xxxx happens, but nobody knows the reason why (worse)
xxxx happens, but nobody knows the reason (better)
xxxx happens, but nobody knows why (better)

没仔细看，错了

Ron说you can see why: if either A or B were true, then D would have to be true as well!。。。

because labor productivity grew by only one percent in 1997, real GDP per capita grew more slowly in 1997 than it had on average between 1873 and 1973.结合前面的生产力的2%在b和c还是选错了，求解释

A.E的not coming显然不对。B,C的have not的tense不对。只剩下D选项。

越做越晕，两次都错选A。连最简单的搭配都还给初中语文老师了。
[keep someone/something from doing something] to prevent someone from doing something or prevent something from happening

a选项burning前不应该加by吗

错选了D，应该就是要capability of doing 吧

真绕～～

不受益就不会本地的基因就不会被稀释，本地基因不会被稀释就不会gene flow,就不会lower fitness，是这样吗？

不太明白～～从本地受益怎么就是前提了呢？不受益就不会lower fitness吗？

一道充分反映GMAC出题思路的SC题