题目

请结合下列实验常用装置，回答有关问题： （1）写出有关标号仪器的名称a（2）实验室制取CO2的方程式为 ，若要获得干燥的二氧化碳，还应选用D装置，并在该装置中盛放 （填写试剂名称）．如果用E装置收集该气体，则气体从 端进入（填“b”或“c”）． （3）实验室若用块状固体和液体无需加热制取气体，可将B装置改进为C装置（多孔隔板用来放块状固体），其改进后的优点是 ．MSG (monosodium glutamate) is a food additive (食品添加剂), which has been widely used by many food factories all over the world since it appeared first in Japan in 1909.MSG is a substance that is added to some food to improve its original (原先的) taste and colour. It is used in foods around the world such as cakes, bread, frozen meats, fish and vegetables. In the beginning, people thought MSG was safe just like salt and sugar. However, in 1968 some people reported they seemed to have bad reactions (反应) to MSG after having had a meal at a restaurant. They included headaches and quick heartbeat (心跳). It was also reported that MSG excited a person's brain and caused his death in Japan. Scientists think that MSG may lead to many neurological disorders (神经紊乱). In mice studies done by a university, the evidence showed the mice didn’t want to eat the food including MSG.Today many food companies “hide” MSG on food labels (标签) by using different names. If you see “natural flavorings”, “hydrolyzed protein” and “spices” in a food label, you are probably seeing a hidden way to “report” MSG in a food label. Every time we have a meal in a restaurant, we always feel the food very delicious to taste, but sometimes it is dangerous for our health because some poisonous food additives have been added to the food.To protect people’s health, our governments, from central to local, are taking actions to stop factories producing poisonous food additives.1. Monosodium Glutamate is _______.A. a food B. an additiveC. a factory D. a country2. MSG is often used in _______.A. frozen meats B. cupsC. clothes D. book covers3.The examples in the second paragraph tell us ________.A. the food including MSG is deliciousB. people like to eat in a restaurantC. mice like eating the food including MSGD. MSG is not safe sometimes4. If you see “natural flavorings”, “hydrolyzed protein” and “spices” in a food label, you will know________.A. you must eat the food in a hidden wayB. the food label must be hiddenC. MSG is probably added to the foodD. you must report the food to your parents5. The underlined word “substance” in the article means __________.A. colour B. material C. taste D. Food