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2016年雅思考试精选阅读训练题(八)免费下载，
int Edition.
Stuart Clark
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&
2016年雅思考试精选阅读训练题(八)
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