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Researchers have found that there are some basic things that you can do to become happier.
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Imagine the following scene: on the grasslands, an elephant stands under an umbrella-like tree.
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Put the old newspapers here,and they will be __________ to produce other things.
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如图,用火柴棒按如图的方式搭一行三角形,搭一个三角形需3枝火柴棒,搭2个三角形需5枝火柴棒,搭3个三角形需7枝火柴棒,照这样的规律搭下去,搭2020个三角形需要火柴棒( )
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杨大叔将一块长方形空地分成两部分(如图),一部分作菜地,另一部分作果园
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