2012年雅思阅读考试考前冲刺试题（8）_第3页

　　1.E

　　See the sentences in paragraph 1(There's a dimmer switch inside the sun that causes its brightness to rise and fall on timescales of around 100,000 years - exactly the same period as between ice ages on Earth.So says a physicist who has created a computer model of our star's core.) and para.2 (Robert Ehrlich of George Mason University in Fairfax, Virginia, modelled the effect of temperature fluctuations in the sun's interior.)中 华 考 试 网

　　2.A B

　　See para.3：?i style='magnetic fields in the sun's core could produce small instabilities in the solar plasma.These instabilities would induce localised oscillations in temperature.

　　13.cycles

　　See para.4：…allow the sun's 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 sun's magnetic field could flip the fluctuations from one cycle length to the other.