But Nature is indifferent to human notions of fairness, and a report by the Fish and Wildlife Service showed a worrisome drop in the populations of several species of North Atlantic sea turtles, notably loggerheads, which can grow to as much as 400 pounds.
60. The author believes that, since the signing of the Kyoto Protocol，____。
A. politicians have started to do something to better the situation
B. few nations have adopted real tough measures to limit energy use
C. reductions in energy consumption have greatly cut back global warming
D. international cooperation has contributed to solving environmental problems
No government will adopt rigid restrictions on economic growth and personal freedom (limits on electricity usage, driving and travel)that might cut back global warming. Still, politicians want to show they're “doing something”. Consider the Kyoto Protoco(京都议定书). It allowed countries that joined to punish those that didn't. But it hasn't reduced CO2 emissions(up about 25% since 1990)， and many signatories(签字国) didn't adopt tough enough policies to hit their 2008-2012 targets。
文中关于京都议定书的内容提到：It allowed countries that joined to punish those that didn't. But it hasn't reduced CO2 emissions(up about 25% since 1990)，and many signatories(签字国) didn't adopt tough enough policies to hit their 2008-2012 targets。这是四六级阅读中常考的细节题，要求考生根据题目，对文章的细节信息做出正确的理解，那么，明确重点内容就成为解决这类题型的关键所在！这里出现了明显转折词but，说明有关京都议定书的重点内容应该位于but之后，而but之后的信息告诉我们，京都议定书的签订并未降低二氧化碳的排放量，且多数签字国并未实施有力的政策去实现他们2008年到2012的环保目标。对比选项，我们不难发现B项：few nations have adopted real tough measures to limit energy use正确描述了转折之后的内容，为该题目的正确答案。
57. What's the opinion of economists about going to college?
A. Huge amounts of money is being wasted on campus socializing。
B. It doesn't pay to run into debt to receive a college education。
C. College education is rewarding in spite of the startling costs。
D. Going to college doesn't necessarily bring the expected returns。
根据题干，我们定位到文章第一段：There are few more sobering online activities than entering data into college-tuition calculators and gasping as the Web spits back a six-figure sum. But economists say families about to go into debt to fund four years of partying, as well as studying, can console themselves with the knowledge that college is an investment that, unlike many bank stocks, should yield huge dividends。文中再次出现转折词but，虽然前文指出，没有什么活动能够比输入大学学费计算器并得出一个六位数的总和更使人感到清醒，但是在but之后，经济学者指出大学会产生很大的收益。因此，在对比选项中我们不难发现C项：College education is rewarding in spite of the startling costs正确对应了原文转折之后的信息，为该题目的正确答案。
63. What does Paula Courtney imply by saying “ … the shopper must also find a replacement” (Line 2， Para. 4)？