题目

一氧化碳、烯烃和氢气在催化剂作用下发生烯烃的醛化反应，又称羰基的合成，如由乙烯可制丙醛：CH2 ＝＝ CH2＋CO＋H2——―→ CH3CH2CHO。由丁烯进行醛化反应也可得到醛，在它的同分异构体中，属于醛的有（   ） A．2种      B．3种     C．4种     D．5种 答案：C完形填空 (共20小题；每小题1.5分，满分 30分)Fred and his wife Edna went to the state fair every year. Every year Fred would say, "Edna, I'd like to   36  in that airplane." And every year Edna would say, "I know Fred, but that airplane ride   37  ten dollars, and ten dollars is ten dollars."One year Fred and Edna went to the fair again and Fred said, "Edna, I'm 71 years old. If I don't ride that airplane this year I may never get another   38 ." Edna replied, "Fred, the airplane ride needs ten dollars, and ten dollars is ten dollars."The   39  overheard them and said, "Folks, I'll make you a   40 . I'll take you both up for a ride. If you can stay   41  for the entire ride and not say one word, I won't    42  you, but if you say one word, it's ten dollars."Fred and Edna agreed and   43  they went. The pilot did all kinds of twists and turns, rolls and dives, but not a word was heard. He did all his   44  over again, but still not a word.They   45  and the pilot turned to Fred, "By golly, I did everything I could think of to get you to yell out, but you   46 ."Fred replied, "Well, I was going to say something when Edna   47  out of the plane, but you know ten dollars is ten dollars."【小题1】A．sitB．rideC．sleepD．hide【小题2】A．losesB．paysC．costsD．benefits【小题3】A．jobB．unitC．familyD．chance【小题4】A．pilotB．policemanC．strangerD．friend【小题5】A．promiseB．planC．requestD．deal【小题6】A．safeB．quietC．kindD．strong【小题7】A．chargeB．punishC．carryD．want【小题8】A．upB．downC．inD．out【小题9】A．deedsB．tricksC．flightsD．attractions【小题10】A．climbedB．flewC．landedD．stopped【小题11】A．failedB．didn’tC．forgotD．moved【小题12】A．walkedB．ranC．fellD．looked