题目

乌头酸的结构简式如图所示，下列关于乌头酸的说法错误的是（ ） A . 化学式为C6H6O6 B . 乌头酸能发生水解反应和加成反应 C . 乌头酸能使酸性高锰酸钾溶液褪色 D . 含1mol乌头酸的溶液最多可消耗3 mol NaOH 答案：B完形填空 　　In 1990 a report was published about what the earth might be like 20 years from then on. The report was a result of a three-year 1 . 　　According to the report, the picture of the earth in the year 2010 is not a 2 one. The world will be more 3 because the population will continue to grow. The population could be 4 6300 million, almost 2500 million more than in 1985. More people would move into cities, especially cities in 5 countries. Cities like Cairo and Jakarta probably would 6 have 15 million by then. 　　Food production will 7 , but not enough to feed all the people. Farmers will grow 90% more food than they did in 1985, 8 most of the increase would be in countries that 9 produce enough food for their people. Little increase is 10 in South Asia, Africa and the Middle East. Poor farming ways are 11 large areas of crop land, changing farms into deserts. More farmland is 12 as cities become larger and more houses are built. 13 will get worse as industrial countries burn more coal and oil. Many of the world's 14 could disappear as more and more trees are cut down. Energy will continue to be a serious problem. The experts say their picture of the earth for the year 2010 15 . They only carried out the situation that 16 today. By changing the situation, by 17 the problems, the picture can be changed. There is 18 time for the nations of the world to work 19 a plan of action. But they warned that 20 too long to make decisions would greatly reduce the chance of success. 1． [　　] A．learningB．project C．noticeD．study 2． [　　] A．pleasedB．pleasant C．safeD．blue 3． [　　] A．dangerousB．beautiful C．crowdedD．terrible 4． [　　] A．no more thanB．as many as C．as much asD．as large as 5． [　　] A．developingB．developed C．bigD．mountainous 6． [　　] A．noneB．each C．allD．neither 7． [　　] A．insistB．reduce C．increaseD．continue 8． [　　] A．soB．but C．orD．however 9． [　　] A．alreadyB．hardly C．partlyD．never 10． [　　] A．wantedB．lacked C．foundD．expected 11． [　　] A．destroyingB．protecting C．disturbingD．interrupting 12． [　　] A．savedB．lost C．discoveredD．used 13． [　　] A．Air pollutionB．Water pollution C．Some diseasesD．All farmland 14． [　　] A．animalsB．plants C．forestsD．people 15． [　　] A．must be trueB．will come true C．can't be trueD．may be wrong 16． [　　] A．happensB．develops C．existsD．appears 17． [　　] A．settlingB．working out C．answeringD．dealing 18． [　　] A．noB．still C．lessD．plenty of 19． [　　] A．aboutB．in C．outD．for 20． [　　] A．workingB．suggesting C．spendingD．waiting