Prior to 1965 geologists assumed
that the two giant rock plates meeting at the San Andreas Fault generate heat Line through friction as they grind past each (5) 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 (10) friction-generated heat could be explained by the kinds of rock com- posing the fault. Geologists’ pre-1965 assumptions concerning heat gen- erated in the fault were based on (15) 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 (20) 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 (25) 10 to 15 kilometers below the Earth’s surface. Byerlee found that when clay samples were subjected to the thou- sands of atmospheres of pressure they would encounter deep inside the (30) 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 (35) rocks’ properties, affects frictional heating. Geologists therefore won- dered 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. Q6: The passage mostly agree that Heney’s findings about temperature in the San Andreas Fault made the greatest contribution in that they - revealed an error in previous measurements of temperature in the San Andreas Fault zone
- indicated the types of clay present in the rocks that form the San Andreas Fault
- established the superiority of a particular technique for evaluating data concerning friction in the San Andreas Fault
- suggested that geologists had inaccurately assumed that giant rock plates that meet at the San Andreas Fault generate heat through friction
- confirmed geologists’ assumptions about the amount of friction generated by common varieties of rocks, such as limestone and granite
answer is D. 我觉得文章最后不是说不光是石头的种类影响摩擦热，压力也是一个很重要的因素。 我觉得的答案应该是A，不是吗。因为文章对于摩擦产生热量没有表示异议，只是对measurements of temperature 不光是石头的种类还应该包括压力这一个因素。 谢谢哪位NN帮我看看吧。实在是想不通。 | 
