her work和后面her discovery and her documentation并列
若为In addition to X, Mary Leakey contributed to Y，则表示X不是contribution。事实上要搞清楚这个in addition to的意思，是除了work之外还有discovery和documentation，他们都导致了contribution
所以应该是In addition to X, Mary Leakey's contributions to Y include..

which后面is as long as和weighs并列

differ in
前后并列
at不能省略

for + n. as for + n.

后面design a number of structures, including a bridge说明了structures就是和bridges并列
which shows就近原则修饰bridge错误
且already是现在完成时
故只有C正确

native American grasses develop a root system but do not grow tall
前面到底是develop这个动作allow还是root system这个东西allow不好确定，但but后面的grow应该和前面develop并列

前半句although，后半句应该没有连词，故只有A正确

AB. 是by更有效率地燃烧，而非by fossil fuels
C. by burning ...... and by replacing ...... 正确
D. by efficiency in burning ...... and by alternatives that ...... 不平行
E. by the burning ...... and by fossil fuels 不平行

A选项had been... 前面哪来的be, 看清选项啊

restrictions 说明不是first hand，而且oral，diary，letters之类的确实属于二手了，他们不是直接观察就制作地图了
the accuracy of these maps is especially dependent on the mapmakers' own interpretive abilities.

3.5 <= x+y < 4.5
0.5 <= x-y < 1.5
两式相加得：
4 <= 2x < 6
2 <= x < 3
没有其他条件无法得出x更close to哪个整数

A survivor of the changes that swept the travel industry as a result of the deregulation of the airlines in 1978 — changes that included dramatic growth in the corporate demand for travel services, as well as extensive restructuring and consolidation within the travel industry .
consolidation→merging

没加1.。。

【转载】".....getting donations from 80 percent of the potential donors they contacted. This success rate, exceptionally high for university fund-raisers, does not indicate that they were doing a good job. "
因为本来大家看到80%的成功捐款率是很NB的，但是其实rate高并不表明游说的人有很努力 因为捐过款的人更倾向再次捐款。
现在A就告诉你，其实smith的筹款人在游说从来没有捐过款人的时候成功率和别的学校筹款人一样。这样就加强了文中的论点，smith那80%的捐款率其实多数是来自以前捐过款的人的。

“Almost like clones in their similarity to one another...” That phrase includes the plural pronoun “their”, so it needs to be followed by a plural noun that could reasonably be described as “like clones” in terms of their similarity to each other.

选项D：speeds是复数名词，不能用单数代词that指代。

woc头一次看到 太有用了！！！

误选了C，其实没有key terms，就是不讲道理地拒绝别人的观点（直接把自己力图要证明的结论拿来用）

progress 存在可接受的歧义，逻辑上progress不能伤害people。in the name of progress 在这里是一个插入状语，修饰personify。

本题的对比对象应为两个收费行为。