9. True

　　See the sentences in para.9 and para.10 .

　　10. constant

　　See para.2: According to the standard view, the temperature of the suns core is held constant by the opposing pressures of gravity and nuclear fusion.

　　11. orbit

　　See para.6: Most scientists believe that the ice ages are the result of subtle changes in Earths orbit, Earths orbit gradually changes shape from a circle to a slight ellipse and back again roughly every 100,000 years.

　　12. instabilities

　　See para.3: magnetic fields in the suns core could produce small instabilities in the solar plasma. These instabilities would induce localised oscillations in temperature.

　　13. cycles

　　See para.4: allow the suns core temperature to oscillate around its average temperature of 13.6 million kelvin in cycles lasting either 100,000 or 41,000 years.

　　14. random

　　See para.4: Ehrlich says that random interactions within the suns magnetic field could flip the fluctuations from one cycle length to the other.

　　以上就是雅思为大家整理的2012年雅思阅读模拟试题（八），非常实用。更多资讯、资料尽在雅思。最后，雅思预祝大家在雅思考试中取得好成绩！

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