题目

纽甜(NTM)结构简式为： 它是目前唯一人工合成安全代糖甜味剂，甜度大约是蔗糖的8000倍。下面是纽甜的一种合成路线：已知：①同一个碳原子上连接2个—OH的结构不稳定，脱水形成 ② +NH2—→ ③ + 请回答： （1） 化合物的结构简式：C，E。 （2） F→G的化学方程式是。 （3） 下列说法正确的是___。 A . 化合物A能发生银镜反应 B . 纽甜的分子式是C20H28O5N2 C . H2NCH2COOH与CH3COCl反应是为了保护氨基不与苯甲醛反应 D . 该工艺同时会生成一阅读理解 阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。 　　The Great Fire of London started in the very early hours of September 2 th, 1666. In four days it destroyed more than three quarters of the old city, where most of the houses were wooden and close together. One hundred thousand people became homeless, but only a few lost their lives. 　　The fire started on Sunday morning in the house of the King's baker(面包师) in Pudding Lane. The baker, with his wife and family, was able to get out through a window in the roof. A strong wind blew the fire from the bakery(面包房) into a small hotel next door. Then it spread quickly into Thames Street. That was the beginning. 　　By eight o'clock three hundred houses were on fire. On Monday nearly a kilometer of the city was burning along the River Thames. Tuesday was the worst day. The fire destroyed many well－known buildings, old St Paul's and the Guildhall among them. 　　Samuel Pepys, the famous writer, wrote about the fire. People threw their things into the river. Many poor people stayed in their houses until the last moment. Birds fell out of the air because of the heat. 　　The fire stopped only when the King finally ordered people to destroy hundreds of buildings in the path of the fire. With nothing left to burn, the fire became weak and finally died out. 　　After the fire, Christopher Wren, the architect(建筑师), wanted a city with wider streets and fine new houses of stone. In fact, the streets are still narrow; but he did build more than fifty churches, among them new St Paul's. 　　The fire caused great pain and loss, but after it London was a better place: a city for the future and not just of the past. 1．The fire began in ________. [　　] A．a hotelB．the palace C．Pudding LaneD．Thames Street 2．The underlined word “family” in the second paragraph means ________. [　　] A．homeB．children C．wife and husbandD．wife and children 3．It seems that the writer of the text was most sorry for the fact that ________. [　　] A．some people lost their lives B．the birds in the sky were killed by the fire C．many famous buildings were destroyed D．the King's bakery was burned down 4．How was the fire put out according to the text? [　　] A．The king and his soldiers came to help. B．All the wooden houses in the city were destroyed. C．People managed to get enough water from the river. D．Houses standing in the direction of the fire were pulled down. 5．Which of the following were reasons for the rapid spread of the big fire? (a)There was a strong wind. (b)The streets were very narrow. (c)Many houses were made of wood. (d)There was not enough water in the city. (e)People did not discover the fire earlier. [　　] A．(a) and (b)B．(a), (b)and (c) C．(a), (b), (c) and (d)D．(a), (b), (c), (d) and (e)