题目

听下面一段较长对话，回答以下小题。【1】Why does the woman call the customer service desk?A.To buy a sweater. B.To get an apology. C.To consult the operator.【2】When is it suitable for the woman to go there?A.At 3 ： 30 pm on Sunday.B.At 8： 30 am on Tuesday.C.At 8 ： 30 am on Saturday. 答案：【答案】【1】C【2】B【解析】【原文】M: Hello. Thank you for calling Spend Mart.W: Is this the Customer Service Desk?M: Yes. How can I help you?W: I bought a sweater from your store a week ago. It says size 12. But actually it is a size 10. Can I exchange it?M: I'd like to apologize for the mistake. Please come with your receipt and the sweater to exchange it for the size you want.W下图表示雌性高等动物的下丘脑神经分泌细胞、垂体细胞、性腺细胞及它们分泌的激素之间的关系。据图回答有关问题：     （1）性激素分泌活动的调节枢纽是                                    。 （2）激素A是          。激素C            ，其能促进雌性生殖器官的发育和生殖细胞的生成，激发和维持        及                   。 （3）如果激素C的合成量过多时，激素A、B含量的变化趋势是        ___________。        这是一种               调节机制。 （4）X细胞作用于垂体细胞，使垂体细胞分泌某种物质，并调节对幼仔的照顾行为， 则X细胞、垂体细胞分泌的物质分别是        、           。在与垂体细胞膜相对应的X细胞的末端，发生的信号变化是                                 。