单词：pahoehoe lava(ropy lava)
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Jack didn't feel like a happy camper anymore. Walking through the cold, thin air, he looked at thesnowmobiles parked near the hut. We don't know how to drive snowmobiles! Jackwhispered to Annie. We haven't trained foranything, including altitude sick
汪培珽儿童英文分级书单《神奇树屋》
Called the hellhole of creation, the Afar Triangle lies at the junction of three continental plates which spread further each year. The oldest living lava lake and one of the lowest points on the planet. Geologists here can study the process that for
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Data from the first flyby of the planet Mercury in January of 2008 by the spacecraft MESSENGER are reported in eleven papers this week in the journal Science. The findings reveal new details about the solar system's smallest planet 77 million kilome
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托福阅读的关键是在于多看多练，为了帮助广大考生更好的复习，小编为大家整理提供托福阅读背景知识，以供各位考生复习参考，生活中有很多事情需要大家细心观察和发现，阅读文章不仅
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