题目

(6分)今年我县各学区都进行了部分学生化学实验操作竞赛，某学区竞赛题目之一是“配制70g20％的氯化钠溶液”。该实验的部分操作如下图所示。(1)需要称取氯化钠的质量是                g，称量时A出现了右盘低的现象，接下来的操作应该是                                       。①左边的平衡螺丝向左调        ②右边的平衡螺丝向右调③右盘中减少砝码              ④左盘中增加食盐(2)B中仪器a的名称是    阅读理解。     An Englishman was showing a foreign visitor around London. "What's that strange building?" asked the visitor. "That's the Tower of London." "I see. How long did it take to build it?" "About 500 years." "In my country we can build it in five months," said the visitor. Shortly after that they came to St. Paul's Cathedral."Very interesting!" said the visitor. "How long did it take to build it?" Nearly forty years." said the Englishman."In my country we can finish it in forty days at most," said the visitor. This went on all day. They visitedmost of the best known buildings in the city. Every time they saw a new one, the visitor asked what it was and how long it took to build it. Then he said that they could do the same thing much faster in his country. At last the Englishman got angry with the visitor though he tried not to show it. Several days later they cameto the House of Parliament (会议) and the visitor asked his usual question, "What is that? The Englishman answered, "It wasn't there last night."1. The Englishman showed the foreign visitor around _____ one day. [     ]A. the Tower of London B. St. Paul's Cathedral C. some famous buildings in the city D. the whole city of London 2. The visitor said that in this country it would take them _____ to build the Tower of London. [     ] A. less than half a year B. forty days C. five hundred years D. fifty days 3. It took them a few days to see _____. [     ]A. some of the best known buildings in England B. several best know places in England. C. many famous houses in the city of London. D. most of the best known buildings in London 4. The Englishman was very angry by the end of the day, but he _____. [     ]A. didn't want to say anything B. tried to show it to the visitor C. had no time to tell the visitor D. tried not to show it to the visitor 5. The Englishman's answer to the question of the last place showed _____. [     ]A. he was sorry that he hadn't seen the building beforeB. he could say nothing because he didn't know anything about it C. he was angry and didn't want to tell the visitor its name D. he didn't know how to tell visitor the name of the building