题目

褪黑素俗称为脑白金，是由哺乳动物和人类的松果体产生的一种激素，具有促进睡眠、抗衰老、调节免疫、抗肿瘤等多项生理功能，其水解的一种产物A的结构简式为．实验室欲以A为原料制备某化合物E，设计如下合成路线： AB（）CD（）E（） 试回答下列问题： （1）A的分子式为 ． （2）写出下列变化的有机反应类型：A→B ，C→D ． （3）A不能直接氧化成E，而要增加A→B和C→D两步反应，其作用是 ． （4）C→D的化学方程式为 ．Let’s be honest. No matter how old we are, most of us love it when our   1   do things for us. It makes our lives easier, and we have less to worry about. Some parents are   2   doing almost everything for their children. They regard their older children （and sometimes even adults）   3   babies! It can be a very common problem in China．In big cities in China, most parents only have one child．Some parents care so much about the   4   of their children that they are afraid to let them go anywhere or do anything by themselves. As a result, their children   5   to learn social skills, and come to depend more on the parents!      In fact, no children really enjoy being looked after by their parents all the time. No parents would be   6   , knowing that, as a result of too much care, their children don’t know about the world! Children need their own time to develop into adults and to learn   7   to deal with problems. Too much care spoils（破坏） their fun when they are growing up. And when suddenly they can’t   8   their parents, they will be in big trouble! It is nice that parents   9   their care and attention to their children. It is nice that children know that their parents’ care and attention is the result of love. And it will be nicer if the children let their parents know how much love they really   10   , and how much love is too much.  1. A．parents                     B．teachers             C．friends                   D．grandparents  2. A．good at                     B．used to               C．interested in           D．worried about  3. A．on                            B．with                   C．of                         D．as  4. A．safety                       B．future                C．health                    D．grades 5. A．forget                       B．want                  C．decide                   D．fail 6. A．angry                        B．surprised            C．happy                    D．sad  7. A．where                       B．how                   C．why                      D．what  8. A．call up                      B．care about          C．depend on              D．look after 9. A．show                        B．bring                  C．make                     D．get 10. A．have                       B．take                   C．give                       D．need