阅读下面的短文，然后按要求写一篇 150 词左右的英语短文。
There are two factors which determine an individual’s intelligence. The first is sort of brain he is born with. Human brains differ considerable, some being more capable than others. But no matter how good a brain he has to begin with, an individual will have a low intelligence unless he has opportunities to learn. So the second factor is what happens to the individual — the sort of the environment in which he is brought up. If an individual is handicapped(受阻碍) environmentally, it is likely that his brain will stop to develop and he will never attain the level of intelligence of which he is capable.
The importance of environment in determining an individual’s intelligence can be proved by the identical twins, Peter and John. When the twins were three months old, their parents died, and they were placed in separate foster(寄养) homes. Peter was reared by parents of low intelligence in an isolated community with poor educational opportunities. John, however, was educated in the home well-to-do parents who had been to college. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. John’s IQ was 125, twenty-five points higher than the average and fully forty points higher than his brother.
[写作内容]
(1)以约30个词概括短文的要点；
(2)然后以约120个词就“环境与人的智力发展”的主题发表看法，并包括如下要点：
a)你是否赞同“环境决定智力的发展”这一观点？为什么？
b)请举出具体事例说明你的观点；
c)你认为如何才能最大限度地发展智力？
[写作要求]
(1)可以参照阅读材料的篇章结构，组织故事，但不得直接引用原文中的句子；
(2)标题自定。
[评分标准]
概括准确，语言规范，内容合适，篇章连贯。