关于生物进化的正确陈述是（）。
A.是在时间进程中个体基因的改变
B.是由于有机体和环境长期交互作用的结果
C.适应环境行为的遗传基因被全部保留下来
D.内部环境提供基因表达的可能性
E.适应环境行为在人的童年期是稳定不变的
参考答案：B
解析：
此题考查的是对行为生物进化的理解，要注意对一些关键词的把握：生物进化是在时间进程中群体基因的改变，是由于有机体和环境长期交互作用的结果，在进化过程中，适应环境行为的遗传基因被有选择地保留下来，而生存环境提供基因表达的可能性，同时这种适应环境行为在人的童年期又存在着极大的可塑性。
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| My first job was at a local restaurant, where I worked for seven years and learned so many lessons, especially from a fellow 1 . Helen was in her 30s and had extraordinary self-confidence, something I was really 2 . I looked up to Helen 3 she was doing what she loved- 4 people better. She always made everyone, customers and co-workers, 5 and feel good. Being a waitress changed my life. One of my 6 customers was Fred. He always ate an omelet, and when I saw him 7 , I tried to have it on his table as soon as he sat down. Thanks to the newfound confidence I 8 from Helen, I dreamed of having my own 9 . But when I called my parents to ask for a loan (贷款), they said, "We just don't have the money." The next day, Fred saw me and asked, "What's 10 ? You're not smiling today." I 11 my dream with him and said, "Fred, I know I can do more if somebody 12 just have faith in me." Before long he handed me checks 13 $50,000-along with a note that I have to this day. It reads, "The only collateral (抵押品) on this loan is my trust in your 14 as a person. Good people with a dream should have the 15 to make that dream come true." I took the checks to Merrill Lynch, where the money was provided for me. I 16 working at the restaurant, making 17 for the restaurant I would open. My plans soured, though, and I lost the 18 . Later I decided to apply for a job at Merrill Lynch. Even though I had no experience, I was 19 and ended up becoming a pretty good agent. 20 I paid back Fred the $50,000 plus 14% annual interest. Five years later, I was able to open my own firm. | ||||
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