题目

得分  我们的生活离不开化学。现有①烧碱②钛合金③熟石灰④盐酸 ⑤碳酸氢钠⑥纯碱，选择适当物质填空（填序号）。 （1）可用于制造人造骨骼的是        。 （2）广泛应用于肥皂、石油、造纸等的是          ； （3）除油污可作炉具清洁剂的是______________； （4）可用来改良酸性土壤的碱是          ； （5）焙制糕点所用的发酵粉的主要成分之一是          。 （6）人体胃液中含有的酸是          ；　　 Mr Robinson worked in Africa . His son, John,was born there. . One winter his family went to England,. John was seven years old then. One day it snowed. The boy went into the garden, and he played in the snow. He said, "Snow is very beautiful, but cold. "Then he said, "What is this? It is a big, round piece of glass. It is beautiful, but cold, too. Who put this glass here? I am going to take it into the house." He took the ice to his father and said, "This is a beautiful piece of glass, but it is very cold and wet. It was on a bucket (桶) of water in the garden." Mr Robinson smiled and said, "Take it to the kitchen, put it in front of the stove (炉子)there, and dry it. "The boy did. He dried(弄干) his hands and then he went to the ice again. He looked at it, and then he took it to his father again. He said, "I put this glass in front of the stove, but it does not get drier. It becomes wetter and smaller."（　 ）36. John didn't know what the ice was, because　　　　　　 .　　　　　　　 A. he was very foolish　　　 B. he was young 　　　　　　　 C. he was born in Africa　　 D. he didn't go to school（　 ）37. One winter Mr and Mrs Robinson went England with　　　　　 .　　　　　　　 A. their son　　　　 B. a boy of their friends 　　　　　　　 C. their daughter　　 D. one of their friend's son（　 ）38. One day John found 　　　　　　　 on a bucket of water.　　　　　　　　A. a piece of glass　 B. a piece of ice　 C. some snow　 D. some water（　 ）39. What did Mr Robinson ask John to do?　　　　　 　　　　　　 A. He asked John to take the ice out.　　　　　　 B. He asked John to put the ice in front of the stove.　　　　　　 C. He asked John not to play with ice.　　　　　　 D. He asked John to dry his hands at once.（　 ）40. After John put the ice in front of the stove, he found that it became　　　　 .　　　　　　　A. dry　　　 B. wetter　　　 C. bigger　　 D. colder