题目

Many years ago, there was a family named Franklin. They lived in Boston. There were five girls and six boys in the family. On a January day in 1706 another baby boy was born. The boy’s mother and her husband gave the boy a name-Benjamin. Benjamin was the brightest of all the children. He could read when he was five and he could write by the time he was seven. When he was eight, he was sent to school. In school, Benjamin had been good at reading and writing but not good at maths. He read all his father’s books. And whenever (无论何时) he had a little money, he spent it on a book.下列那项不属于变异概念的范围？A．生物与生物之间 B.子代个体之间 C．亲代与子代之间 D.性状上的差异