Most English people have three names: a first name, a middle name and the family name. Their family name comes last. For example, my full name is Jim Allan Green. Green is my family name .My parents gave me both of my other names.

    People don't use their middle names very much. So “John Henry Brown” is usually called “John Brown”. People never use Mr., Mrs. or Miss before their first names. So you can say John Brown, or Mr. Brown; but you should never say Mr. John. They use Mr., Mrs. or Miss with the family name but never with the first name.

    Sometimes people ask me about my name. “When you were born, why did your parents call you Jim?” they ask. "Why did they choose that name?” The answer is they didn't call Jim. They called me James. James was the name of my grandfather. In England, people usually call me Jim for short. That's because it is shorter and easier than James.

你在探究“光对鼠妇生活的影响”实验时，如何保证实验结果的不同只是由于光照的不同而引起的（    ）

一个有耳垂（Aa）的男性和一个无耳垂（aa）的女性结婚，生下有耳垂子女的概率是（ ）