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2?4~5?????????
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(a)?

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(b)?

(1)??????

(2)?

(3)(1)(2)

(c)?

(1)?

(2)???

(3)???

(4)???????

(5)?????

(6)?????????

(7)????

(8)??5-10???

(9)?????????10-15??????

(10)?????????15-20?

(11)250??750???231?67?????????12?

(12)10?100?

(13)?????????2????

(14)15???12?????23???

(15)??4?????...