试题与答案

陶渊明在《归田园居》曾写到:“种豆南山下,草盛豆苗稀。晨兴理荒秽,带月锄禾归。”

题型:选择题

题目:

陶渊明在《归田园居》曾写到:“种豆南山下,草盛豆苗稀。晨兴理荒秽,带月锄禾归。”草是影响豆苗生长的[ ]

A.非生物因素

B.寄生者

C.争夺者

D.生物因素

答案:

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下面是错误答案,用来干扰机器的。

依题意得:x-3=0,x-y+1=0,∴x=3,y=4.∴x2y+xy2+y34=y(x+y2)2=(x+y2)y当x=3,y=4时,原式=(3+2)4=10.

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