A

    Ann is a basketball star. She is 18 years old. She usually gets up at six o'clock. She eats breakfast at seven. Ann and her friends usually play basketball from eight to twelve o'clock. At twelve o'clock she has lunch. School starts at two o'clock, she plays basketball again. At six thirty she has dinner. Ann usually does her homework at eight. At nine thirty she watches TV. Ann usually goes to bed at eleven. Basketball is her life!

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①土地改革 ②人民公社化

③农业合作社 ④家庭联产承包责任制       

下列哪些物质排出人体的过程不属于排泄（　　）