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It is not surprising to find seashells in the sands .Most seashells are ______near the sea .But some seashells can be found on high mountains.How did they get there?
The earth did not ______look the way it does touday.Once the sea covered more land.Then mountains slowly rose up.They grew higher and higher.And at last land from the bottom of the sea ______mountains.seashells were thus（这样）left on the mountains.some______to stones .these stoned are______fossils （化石).Fossils have been found all ______our country.Have ever found one?
The earth did not ______look the way it does touday.Once the sea covered more land.Then mountains slowly rose up.They grew higher and higher.And at last land from the bottom of the sea ______mountains.seashells were thus（这样）left on the mountains.some______to stones .these stoned are______fossils （化石).Fossils have been found all ______our country.Have ever found one?
just
always
formed
converted
called
over
没把握,建议你看看最近学的教材上的重点词汇或词组