14. For years, scientists have believed that a certain hormone produced by the human liver was triggered by Enzyme U, which is released in the pancreas. Recently, however, researchers in Belgium discovered that Enzyme U is always preceded by the release of Enzyme W in the brain. Based on this, these researchers hypothesize that Enzyme W, not Enzyme U, triggers the production of the liver hormone.
If a second research project were set up to verify the findings of the Belgian researchers, which of the following test results would most seriously weaken their hypothesis?
(A) Enzyme W is released, but not followed by the release of Enzyme U, although the liver hormone is produced.
(B) Enzyme U is released, but neither preceded by the release of Enzyme W, nor followed by the production of the liver hormone.
(C) Neither Enzyme W nor Enzyme U is released and the liver hormone is not produced.
(D) Enzyme W is released, followed by the release of Enzyme U and the production of the liver hormone.
(E) Enzyme U is released and followed by the production of the liver hormone, although Enzyme W is not released.
答案应该没问题的吧。。这是KAPLAN的解释： (E) directly counters the hypothesis by providing an example of the effect without the supposed cause. If the release of Enzyme U is followed by the production of the liver hormone, even though Enzyme W was not released, then that hammers the researchers' conclusion that Enzyme W is responsible for the hormone. (C) is perfectly consistent with the hypothesis: Without W, the researchers would not expect the liver hormone to be produced.
