3. C.最后一段从腐殖质土壤被改变，新形成的矿物质土壤易流失，和当地植物很难在矿物质土层中扎根等三个方面论述了亚洲蚯蚓对五大湖区生态的影响。

　　阅读理解2017·潍坊5月模拟“Oh，you must have been a spoiled (宠坏的) kid.You must be really bossy.I wonder what you’re going to be like to deal with？” That’s often the response Angela Hult gets when people find out she’s an only child，she told ABC News.Despite such negative (消极的) remarks，Hult has decided to have only one child herself.And she’s not alone.

　　According to the US’ Office for National Statistics，women approaching the end of their childbearing years had an average of 1.9 children in 2004，compared with 3.1 for their counterparts in 1976.The percentage of one­child families in Britain had risen from 18 percent in 1972 to 26 percent in 2007.

　　But even though only children are becoming increasingly common，the traditional view that they’re selfish，spoiled and lack social skills holds strong.Even parents of only children，like Hult，are made to feel guilty about having only one child.Worried that they’re being selfish and endangering their child’s future，they flock to online discussion forums seeking advice.Soon，however，they ask themselves：is this social prejudice really reasonable?

　　“There have been hundreds and hundreds of research studies that show that only children are no different from their peers (同龄人)，” Susan Newman，a social psychologist at Rutgers University in the US，told ABC News.

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