A woman is having some trouble(患病) with her eyes, so she goes to see the doctor. He is a new doctor and doesn’t know her, so he asks some questions and one of them is, “How old are you?”

     The woman says, “I don’t know, doctor, but let me think about it.” She thinks for a few minutes and then says, “Yes, I know now, doctor! When I marry(结婚), I am eighteen years old, and my husband is thirty. Now my husband is sixty. And that is twice(两倍) thirty. So I am twice eighteen. That’s thirty-six, isn’t it?”

下列说法正确的是（　　）

东晋南朝时期，分产异炊的现象在以建康为中心的江南地区十分突出．《宋书•周朗传》云：“今士大夫以下，父母在而兄弟异计，十家而七矣．庶人父子殊产，亦八家而五矣。”这从根本上反映出江南地区（　　）

如图所示的实验操作中，正确的是（   ）