题目

如右图所示，一定条件下将1mol A2气体和3molB2气体充入一容积可变的密闭容器中，可滑动的活塞的位置如图1所示。在恒温恒压下发生如下反应：A2(g)+3B2(g)2AB3(g)。当反应达到平衡时，活塞位置如图2所示，则平衡时A的转化率是（    ）   A．20%            B．40%             C．60%          D．无法确定根据短文内容及首字母提示完成短文。（每空一词，共l0题，每题l分，计l0分) Happiness is for everyone. In f  1. , happiness is always around you if you put your heart into it. When you are in t  2. at school, your friends will help you; when you study hard at your lessons, your parents are always taking good c  3.  of your life and your health; when you get s 4. , your friends will congratulate you; when you do something w 5. , people around you will help you to correct(纠正) it. And when you do something good to o 6. , you will feel happy, too. All these are your happiness. If you notice a bit of them, you can find that happiness is always around you. Happiness is not the s 7. as money, it's a feeling of your heart. When you are p  8.  , you can also be very happy, because you have something else that can't be bought with money. When you meet with difficulties, you can say loudly you are very happy, because you have more chances to challenge(挑战) y  9.  . So you cannot always say you are poor and you have bad luck. If you take every chance you get, you can be a happy and  l  10.   person .