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  3. The brains of children are affected by family violence in the same way as combat affects soldiers, according to a study. In bot

The brains of children are affected by family violence in the same way as combat affects soldiers, according to a study. In bot

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问题     The brains of children are affected by family violence in the
same way as combat affects soldiers, according to a study. In both
cases the brain becomes increasing wary of potential threats.【M1】______
Children who suffer abuse or witness domestic violence are known
to be at greater risk of anxiety and depression in late life.【M2】______
    Scientists carried out magnetic resonance imaging brain scans
on 20 London children with an average age of 12 who have been【M3】______
exposed to documented violence at home. All had referred to local【M4】______
social services. While in the scanner, the children were shown
pictures of male or female faces with sad, calm or angry【M5】______
expressions. Their patterns of brain activity were compared with
that of 23 matched children with no history of family violence.【M6】______
The children exposed to violence responded in the distinct way to【M7】______
angry faces, the study found. Their brains showed heightened
activation in two regions associated with threat detection.
    Previous research has shown a similar pattern in the brains of
soldiers exposed to violence combat situations. The scans suggest
both combat veteran soldiers and children who witness violence
tuning their brains to be hyper-aware of environmental danger.【M8】______
    Lead author Dr Eamon McCrory, from UCL’s Division of
Psychology and Language Sciences, said: "We are only now
beginning to understand how child abuse influences function of the【M9】______
brain’s emotional systems. This research is important because it
provides with our first clues as to how regions in the child’s brain【M10】______
may adapt to early experiences of abuse in the home."
【M3】
选项
答案have—had
解析 语法错误。主句的谓语动词carry out使用了过去时态，而从句的动作be exposed to显然是在主句动作之前发生的，所以从句的谓语动词应使用过去完成时态，故把have改为had。
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