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请教托福语法

xueqiu (bmw)
1.Today's nuclear fission fuels are the remnants of (which) used to be a (much more) active mixture of radioactive and fissionable materials two billion (years ago) and (earlier).
2.Petrography (concerns) primarily with the detailed (description) and classification of rocks, (whereas) petrology deals primarily with rock (formation).
(#319988@0)
2002-1-1 -04:00
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