GWD2-10

xyredpoppy

        Prior to 1965 geologists assumed
                that the two giant rock plates meeting at
                the San Andreas Fault generate heat
                through friction as they grind past each
                other, but
                in 1965
                Henyey found
                that
                temperatures in drill holes near the
                fault were not as elevated as had
                been expected.  Some geologists
                wondered whether the absence of
                friction-generated heat could be
                explained by the kinds of rock com-posing the fault.  Geologists’ pre-1965
                assumptions concerning heat generated in the fault were based on
                calculations about common varieties of
                rocks, such as limestone and granite;
                but “weaker” materials, such as clays,
                had already been identified in samples
                retrieved from the fault zone.  Under
                normal conditions, rocks composed of
                clay produce far less friction than do
                other rock types.

       In 1992 Byerlee tested whether
            these materials would produce
            friction
            10 to 15 kilometers below the Earth’s
            surface.  Byerlee found that when clay
            samples were subjected to the thousands of atmospheres of pressure
            they would encounter deep inside the
            Earth, they produced as much friction
            as was produced by other rock types.
            The harder rocks push against each
            other, the hotter they become; in other
            words, pressure
            itself, not only the
            rocks’ properties, affects frictional
            heating.  Geologists therefore wondered whether the friction between the
            plates was being reduced by pockets
            of pressurized water within the fault that
            push the plates away from each other.

 

现象解释

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Q10:   

The passage suggests which of the following regarding Henyey’s findings about temperature in the San Andreas Fault?

          

1. Scientists have yet to formulate a definitive explanation for Henyey’s findings.

2. Recent research suggests that Henyey’s explanation for the findings should be modified.

3. Henyey’s findings had to be recalculated in light of Byerlee’s 1992 experiment.

4. Henyey’s findings provided support for an assumption long held by geologists.

5. Scientists have been unable to duplicate Henyey’s findings using more recent experimental methods.

Answer: A

如绿字标出：Geologists therefore wondered whether the friction between the
                plates was being reduced by pockets
                of pressurized water within the fault that
                push the plates away from each other.

科学家们只是wondered, 并没有说给出definitive explanation，也就是只是猜测，没有给出定论呢。

倒是觉得C说的还有点靠谱，虽然也有不对的地方...

xyredpoppy

哪位NN给个解释吧~

onedayling

我也是第一个排除A,顶~

期盼nn解答