题目内容
The model can not only ________ the structures of the molecules but also how they move and interact in relation to each other.
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He traveled homeward through a region made barren by ________ and dust storm. On the way he met Jim Casy an ex-preacher.
When we step outside and ________ ourselves in this natural world， we open ourselves to the enlightenment that is all around, just waiting to be reflected in each one of us.
We often ________ a hike to the top of the mountain to see beautiful sights.
My only other advice is to ________ every moment with those you love at every stage of your journey, as I have done this summer.
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