作业：
1.plate
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bento
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3.fancy
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4.plate apple
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5.#fancy pickle
6.apple.small
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7.orange.small
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8.bento orange.small
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9.plate , bento
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10.*
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11.plate *
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12.plate + apple
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13.bento ~ pickle
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- plate > apple
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15.plate orange:first-child
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16.plate *:only-child
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17.#fancy *:last-child , plate + pickle
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18.plate:nth-child(3)
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19.bento:nth-last-child(4)
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20.apple:first-of-type
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21.plate:nth-of-type(2n)
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22.plate:nth-of-type(2n+3)
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23.plate apple.small:only-of-type
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-
orange:last-of-type , apple:last-of-type
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25.bento:empty
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26.apple:not(.small)
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