Task：Many scientists believe that now we can study the behavior of a three-year-old child to see whether they will grow up to be criminals. To what extent do you think the human nature produces crimes? And how can we prevent children from growing up to be criminals?

思路解析：

1. 基因论是有点道理的。举例，科学已经证明，某些基因缺陷会导致大脑荷尔蒙的分泌功能紊乱，这会导致人在很小的时候就显示出负面的性格，如缺乏残忍，缺乏同情心和负罪感。在长大之后，这些病态的特征会刺激他们做出暴力的行为。

2. 然而，父母在塑造孩子思维的过程中同样起到很大作用。举例，糟糕的父母管教，如采用暴力来体罚孩子，会让孩子变得有侵略性，冷漠，以及反社会的思想。

3. 此外，来自媒体的暴力镜头同样会影响孩子们。举例，电影中人们总是通过犯罪来解决问题，或是获得财富。这扭曲了孩子们的价值观，让他们误以为通过犯罪来谋生是合适的。

参考范文：

Does a child’s performance at the age of 3 decide whether he or she would be a criminal in the future? Personally, I partially agree that gene defects in some cases indeed cause some illegal actions, while it is unwise to attribute all crimes to the gene problem, and my reasons will be explored as below.

Admittedly, to the extent of Geneticism, this assertion is reasonable, because some of human behaviors, attitudes and characteristics are determined by DNA, and there is always homeotypical continuity from inappropriate behaviors in childhood to criminality in adulthood. For example, symptoms of gene-based psychological abnormality, which stems from the imbalanced secretion of hormones in brain, can be reflected in the very young age as inattention, restlessness, apathy, the lack of guilt about wrongdoings, and unkindness to other children. In adulthood, there is a high possibility that these morbid emotional traits evolve into anti-social minds--specifically, disregarding of rights of others or rules of society, irresponsibility, aggressive personalities and misperceptions about the right and wrong.

However, I strongly believe this assertion is problematic, for the reason that it completely underestimates more fundamental influences of other aspects on children after their birth. Firstly, parents always play a key role in children’s formative education that directly shapes behaviors, minds and values of them. For example, poor parenting skills in daily life, such as violence and corporal punishment, tend to make personalities of children aggressive and rude, even irritable, which might turn into dangerous behaviors and anti-social minds in adulthood.

Besides, violent contents on the internet, TV programs and video games are also responsible for juvenile crimes. It is because youngsters, unlike adults, are lack of abilities to distinguish right from wrong. Therefore, too much violence in the virtual world could twist the social values of young viewers. As a result, they, more often than not, consider violence as the main or even only way to solve problems, thereby leading to crimes.

In conclusion, there are more factors that might result in delinquencies of the youth than genes, and the impacts from parents and media on children’s growth are bigger than that from DNA.

(360 words)