找准定位 Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18. The degree of enrichment can be d
主旨题一般从原文第一句找 ： Among the myths taken as fact by the environmental managers of most corporations is the belief that environmental regulations affect all competitors in a given industry uniformly. In reality,
A选项 并没有提及不同的management problem
Until recently, zoologists believed that all species of phocids (true seals), a pinniped family, use a different maternalstrategy than do otariids (fur seals and sea lions), another pinniped family.
Zoologists had assumed that females of all phocid species, by contrast, use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period
定位在这两句
两个都是在谈论效率
Theoretical literature offers conflicting views on whether nonprofit hospitals are less financially 【efficient】
The same literature offers similarly conflicting views of the 【efficiency】 of nonprofit hospitals from a social welfare perspective.
efficiency 的两个方面
因为是成对出现的，所以会误以为是另外一个对比而错选D
选项描述也较为抽象 增加了理解的难度
additional contrast→ 非效率方面的对比
a particular aspect of one of the types of 【hospitals】 discussed earlier→两个医院的另一个方面
D. Leakey's contributions to archaeology include her discovery of the earliest direct evidence of hominid activity and her painstaking documentation of
这题错了，同一句话有俩题，这一题肯定选A， D都不平行，估计毕老师吧这题和下面这题的答案搞混了，这面这题是D
In addition to her work on the Miocene hominid fossil record, Mary Leakey contributed to archaeology with her discovery of the earliest direct evidence of hominid activity and painstakingly documenting East African cave paintings.
A. Leakey contributed to archaeology with her discovery of the earliest direct evidence of hominid activity and painstakingly documenting
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E选项句子成分分析我理解错了，想问下，我以为which引导了一个定语从句修饰bricks，所以没有觉得这两句是平行关系。我没有看出来which这句和前面that bricks were formed from mud or clay,是平行从句。能让我知道我错哪儿了吗？多谢啦