6. False See para.7： "In Milankovitch， there is certainly no good idea why the frequency should change from one to another，" …… Nor is the transition problem the only one the Milankovitch theory faces.

　　7. Not Given See para.8： if sea ice begins to form because of a slight cooling， carbon dioxide?is locked into the ice. That weakens the greenhouse effect. (The passage doesn抰 mention anything about locking Co2 into ice artificially.)

　　8. True See para.9： there is no lack of such mechanisms. "If you add their effects together， there is more than enough feedback to make Milankovitch work，"?"The problem now is identifying which mechanisms are at work." This is why scientists like Edwards are not yet ready to give up on the current theory.

　　9. True See the sentences in para.9 (According to Edwards， 卙e says. "I can't see any way of testing [Ehrlich's] idea to see where we are in the temperature oscillation.") and para.10 (Ehrlich concedes this. "If there is a way to test this theory on the sun， I can't think of one that is practical)。

　　10. constant See para.2： According to the standard view， the temperature of the sun's 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 Earth's orbit， 匛arth's orbit gradually changes shape from a circle to a slight ellipse and back again roughly every 100，000 years.

　　12. instabilities See para.3： ?i style='mso-bidi-font-style：normal'>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