题目

分析下表,可推测溶液双缩脲试剂碘液斐林试剂甲+——乙—++—甲、乙混合+++ 注:“+”表示显色,“++”表示显色更深;“-”表示不显色。A. 甲溶液含有淀粉 B. 乙溶液含有还原糖C. 混合溶液不含淀粉 D. 混合溶液含有蛋白质 答案：【答案】D【解析】分析表格：淀粉遇碘变蓝色．表中乙溶液加碘液后显色且较深，说明乙是淀粉溶液．甲、乙混合液加碘液也显色，说明甲、乙混合液中含有淀粉，但颜色较浅，说明有部分淀粉已被甲水解．甲和双缩脲试剂发生显色反应，说明甲的化学本质是蛋白质，结合以上分析可推知甲是淀粉酶溶阅读理解。     I fell in love with the minister's son the winter I turned fourteen. He was not Chinese. For Christmas  I  prayed for the boy, Robert. When I found out that my parents had invited the minister's family over for Christmas Eve dinner, I cried in panic. What would Robert think of our shabby Chinese Christmas?What would he think of our noisy Chinese relatives who lacked proper American manners?     On Christmas Eve, my mother created abundant Chinese food. And then they arrived-the minister'sfamily and all my relatives. Robert greeted hello, and I pretended he was not worthy of existence.      Dinner threw me deeper into disappointment. My relatives licked (舔) the ends of their chopsticks and reached across the table. Robert and his family waited patiently for a large plate to be passed to them. My relatives murmured with pleasure when my mother brought out the whole steamed fish. Robertmade a face.   Then my father reached his chopsticks just below the fish eye and picked out the soft meat. "Amy, your favorite." he said, offering me the tender fish cheek. I wanted to disappear.     At the end of the meal, my father leaned back and burped(打嗝) loudly, thanking my mother for her fine cooking. "It's a polite Chinese custom to show you are satisfied." explained my father to ourastonished guests. Robert was looking down at his plate with a reddish face. The minister managed tobring up a quiet burp. I was shocked into silence for the rest of the night.     After everyone had gone, my mother said to me ,"You want to be the same as American girls on the outside." She handed me an early gift.It was a miniskirt ."But inside you must always be Chinese. Youmust be proud that you are different. Your only shame is to have shame."     It was not until years later that I was able to fully appreciate her lesson and the purpose behind her particular menu. For Christmas Eve that year, she had chosen excellent Chinese food.1. When the writer found out the minister's family    would come for Christmas Eve dinner, she      cried    mainly because ________.A. she worried about their shabby Chinese ChristmasB. she worried about their Chinese relatives lacking American mannersC. she worried about meeting the minister's familyD. she worried about being laughed at2. What does "he was not worthy of existence" probably mean? It means________.A. the writer was not interested in his existenceB. he was worthlessC. he should not existD. the writer expected his coming3. The dinner threw the writer deeper into disappointment mainly because________.A. her relatives licked the ends of their chopsticksB. her father reached his chopsticks to pick fish for herC. her father leaned back and burped loudlyD. she childishly expected all of them to act in the same way as Americans at table4. We can infer from the passage that ________.A. the writer appreciated her mother's lesson years laterB. the writer must be proud that she is differentC. the mother prepared to show Chinese different food cultureD. the minister's family really enjoyed the food