小伙伴們，雅思考試大家復習的怎么樣了呢？下面是幫考網分享的雅思考試閱讀部分的練習題，一起來看看吧！

雅思閱讀練習及答案：

Answer keys and explanations:

1. E

See the sentences in paragraph 1(There\'s adimmer switch inside the sun that causes itsbrightness to rise and fall on timescales of around100,000 years—exactly the same period as betweenice ages on Earth. So says a physicist who hascreated a computer model of our star\'s core.) andpara.2 (Robert Ehrlich of George Mason University inFairfax, Virginia, modelled the effect of temperaturefluctuations in the sun\'s interior.)

2. A B

See para.3: ?i style=’normal’>Grandpierre and a collaborator, Gábor ágoston,calculated that magnetic fields in the sun\'s core could produce small instabilities in the solarplasma.

3. C

See para.8: Edwards believes the small changes in solar heating produced by Milankovitchcycles are then amplified by feedback mechanisms on Earth.

4. D

See para.11: Nigel Weiss, a solar physicist at the University of Cambridge, is far fromconvinced. He describes Ehrlich’s claims as "utterly implausible".

5. False

See para.5: for the past million years, ice ages have occurred roughly every 100,000 years.Before that, they occurred roughly every 41,000 years.

6. False

See para.7: "In Milankovitch, there is certainly no good idea why the frequency shouldchange from one to another," ... Nor is the transition problem the only one the Milankovitchtheory faces.

7. Not Given

See para.8: if sea ice begins to form because of a slight cooling, carbon dioxide?is lockedinto the ice. That weakens the greenhouse effect. (The passage doesn抰 mention anythingabout locking Co2 into ice artificially.)

8. True

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

9. True

See the sentences in para.9 (According to Edwards, 卙e says. "I can\'t see any way oftesting [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 thatis practical).

10. constant

See para.2: According to the standard view, the temperature of the sun\'s core is heldconstant 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 inEarth’s orbit, arth\'s orbit gradually changes shape from a circle to a slight ellipse and backagain roughly every 100,000 years.

12. instabilities

See para.3: ?i style=’magnetic fields in the sun\'s core could produce small instabilities inthe 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 averagetemperature 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 flipthe fluctuations from one cycle length to the other.

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