______(50)A.To avoid being exploited mothers with
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______(50)
A.To avoid being exploited,mothers with a partner hold back from working too hard if the father is being lazy,and it’s the chicks that pay the price.
B.To find out,they measured how much effort zebra finch parents put into raising their babies.
C.Those males reared by single mums were chosen more often than those from two一parent families.
D.With two parents around,there’s always a conflict of interests,which can have a detrimental effect on the quality of the offspring.
E.Kilner says conflict of parents should now be taken into account as well.
F.It turned out that single mums had greater influence on their offspring.
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答案：E
最后一段第一句说研究人员发现夫妻之间的矛盾冲突对于后代的行为、窝卵数，甚至是外表都会产生很大的影响。空前的一句又说人们通常认为雌性的生殖策略会受捕猎和食物供应的影响。此空处的内容应为建议将夫妻冲突的影响也考虑在内，故选E。