题目

下列有关盐酸在实验中的作用，描述不正确的是（ ） 试验目的主要作用①斯他林和贝利斯发现促胰液素在盐酸的作用下，小肠粘膜可能产生一种化学物质②探究pH对酶活性的影响设定酶促反应溶液的pH③观察细胞有丝分裂盐酸处理根尖的同时也为龙胆紫染色创造酸性环境④用甲基绿和吡罗红检测DNA和RNA在细胞中的分布盐酸处理染色质能促进DNA与吡罗红结合⑤观察线粒体盐酸处理细胞有利于健那绿对线粒体染色 A . ③④⑤ B . ①②⑤ C . ②④⑤ D . ①Mr．King goes to a dinner party．He is wearing old clothes．He comes into the room．But people in the room do not look at him．They don’t ask him to sit at the table．Mr.King goes home and puts on his good clothes．He goes back to the party.Everyone in the room stands up and smiles at him．They give him the very good food to eat．Mr．King takes off his coat，and puts it in the food and says，“Eat，coat!”The other people ask，“What are you doing?”He answers，“I'm asking my coat to eat the food．I am wearing my old clothes．You do not look at me．You do not ask me to sit down． Now， I am in these clothes．And you give me very good food． Now I see，you give the food for my clothes not for me!”1.Mr．King goes to the dinner party，but people in the room don’t look at him，because .A. he doesn't come by car B. he is wearing his old clothesC. he is old D. he is poor2.Mr．King goes home to ．A. put on his good clothes B. take off his good clothesC. buy good clothes D. bring some present3.Mr．King goes back to the party．People in the room stand up and smile at him because ．A. he is wearing his old clothes B. he is wearing his good clothesC. he comes back in a good car D. he is very famous4.Mr．king takes off his coat，and ．A. eats the good food B. asks it to eat the good foodC. asks the other to eat the food D. have dinner with the people5.Now Mr．King sees the good food is ．A. for his clothes B. for him C. for his good car D. for his pet