某有机物与过量的金属钠反应，得气体V_A L ，另一份等质量的该有机物与纯碱反应，得气体V_B L（同温同压）。若V_B ≠0且V_A>V_B ，则有机物是（      ）

把一个细胞中的磷脂分子全部提取出来，在空气和水界面上将它们铺成单分子层（假定单分子间距离适当且相等），推测在下列生物中空气和水界面上磷脂分子层的表面积与原细胞的表面积之比最小的细胞是（　　）

⑴Mom and Dad are the most important people in your life. They have been looking after you since you were born. ⑵你应该一直爱他们。You should also get on well with them. But some children don't know how to do this. Here are some ways to help you. Spend more time with your parents. ⑶Don't spend too much time playing computer games or watching TV. Ask your parents to play with you. ⑷和他们交谈或者散步。 Be kind to your parents. You can make them happy with a smile when you come home. You can send your mother a card on Mother's Day or tell your father a joke on his birthday. ⑸You can also clean your room by yourself. Work hard. If you do your best in your studies, your parents will be proud of you.

作家郭敬明曾说过：“喜欢写大量文字的花季雨季的女生，都是孤独的女孩。”其实，也有许多喜欢写作的女孩是活泼可爱、情感丰富的。这说明青春期的中学生（    ）