求解GWD-3-Q6

kelebonnie

GWD-3-Q6:  
  In 1994, a team of scientists led by David Mckay began studying the meteorite ALH84001, which had been discovered in Antarctica in 1984. Two years later, the McKay team announced that ALH84001, which scientists generally agree originated on Mars, contained compelling evidence that life once existed on Mars. This evidence includes the discovery of organic molecules in ALH84001, the first ever found in Martian rock. Organic molecules—complex, carbonbased compounds—form the basis for terrestrial life.  The organic molecules found in ALH84001 are polycyclic aromatic hydrocarbons, or PAH’s.  When microbes die, their organic material often decays into PAH’s.
        Skepticism about the McKay team’s claim remains, however.  For example, ALH84001 has been on earth for 13,000 years, suggesting to some scientists that its PAH’s might have resulted form terrestrial contamination. However, McKay’s team has demonstrated that the concentration of PAH’s increases as one looks deeper into ALH84001, contrary to what one would expect from terrestrial contamination. The skeptic’s strongest argument, however, is that processes unrelated to organic life can easily produce all the evidence found by McKay’ s team, including PAH’s.  For example, star formation produces PAH’s.  Moreover, PAH’s frequently appear in other meteorites, and no one attributes their presence to life processes. Yet McKay’s team notes that the particular combination of PAH’s in ALH84001 is more similar to the combinations produced by decaying organisms than to those originating form nonbiological processes.

 
The primary purpose of the passage is to
       
A.    describe new ways of studying the possibility that life once existed on Mars 无
B.    revise a theory regarding the existence of life on Mars in light of new evidence 反 不是revise，而是refute
C.    reconcile conflicting viewpoints regarding the possibility that life once existed on Mars  无
D.    evaluate a recently proposed argument concerning the origin of ALH84001 无
E.    describe a controversy 论战concerning the significance of evidence from ALH84001
为什么不选C 选项呢？  第二段中，McKay team 对Skepticism的每一个问题都给予了合理的解释，不就是reconcile吗？是我对reconcile的理解有误吗？请大家指教

anjjule

reconcile是调解,使一致，而第2段更多的在辩论，DM用证据来反驳怀疑者的质疑，不能算reconcile

这个选项被排除的原因其实是后面的信息 生命曾在火星的可能性，which scientists generally agree originated on Mars,这个是没有疑问的

kelebonnie

谢谢~