“绿色化学”能实现零排放(即反应物中的原子利用率达到100%)。CO和H₂在一定条件下按照不同的比例可以合成不同的有机化工原料。根据零排放的要求，以CO和H₂合成的有机物不可能是（）

改革开放以来，一家三代的交通工具发生了变化（如下图）。从这个变化中，我们可以感受到（   ）

    Everyone, rich or poor, can have happiness. You don't need to think too much about those 1 people. They may always feel lonely (孤独的) 2 their houses are too big, and they may want to take a 3 on country roads because they drive to work every day in the busy city.

    4, happiness is always around you. When you are unhappy, your friends will come to   5 you and this will make you happy. When you study hard at your lessons, you will get good marks and of course you will 6 happy about it. If you don't feel 7, your parents will take good care of you and you will be happy. When you are 8, you can also say you are happy because you may have something else that money can't buy. When you 9 problems, say loudly that you are happy because you have 10 chances to challenge (挑战) yourself. Then you can succeed (成功) in what you do and this may bring you happiness.

场____       普____        忧____       陡____

扬____       谱____        犹____       徒____