Thumbs up！

不过您找到的不是高考题的原文 :((

... have stopped learning / on growing...

在成长过程中，停止学习（失去学习的兴趣）

on doing这个用法，可以看着是as soon as引导的时间状语。但具体叫什么，多请教曹佬和刘佬，我对语法研究不敢兴趣。如果我懂得一个句子的意思，我就不会浪费时间去做语法分析，哈哈

我认为，这里拼写有误。on 应为 or。

我刚刚找到了原文：这是 John.W.Gardner 于1991年在斯坦福大学百年校庆毕业典礼上的演讲。

不知是天津命题自身有误，还是网络转摘有误。原文如下：

"…Wallace Stegner, in his remarks on Founders' Day, dealt brilliantly with the historical background of this centennial occasion. I want to talk about you who are receiving degrees today - you and your lives ahead. 

Let's begin by assessing your present situation. I don't agree with David Starr Jordan that you are children. You are now, for better or worse, adults. 

At puberty you were made self-conscious by the apparent attention of others. Now you are old enough to know that most people aren't studying you critically; they are thinking about themselves.

Up to this point your jury in most matters has been packed by your elders. Now you must be willing to be judged by your peers - if you think you have any.

At age 16 you were old enough to doubt. Now you're old enough to believe again and to bring doubt and belief into some kind of productive balance. 

In your mid-teens you became old enough so that your parents could stop punishing you. Now you're old enough to stop punishing your parents.

I once wrote a book called Self-Renewal that dealt with the decay and renewal of societies, organizations and individuals. I explored the question of why civilizations die and how they sometimes renew themselves, and the puzzle of why some men and women go to seed while others remain vital all their lives. And it is the latter question that concerns me today.

In the years ahead you will find that some of your contemporaries, even ones in fortunate circumstances with responsible positions, seem to run out of steam earlier than need be. 

…I'm not talking about people who fail to get to the top in achievement. We can't all get to the top, and that isn't the point of life anyway. I'm talking about people who have stopped learning or growing or trying. And I don't deride that. Just to keep on keeping on is sometimes an act of courage. But I do worry about men and women functioning far below the level of their possibilities. It need not happen.

As you settle into your adult lives, you cannot write off the danger of complacency, boredom, growing rigidity, imprisonment by your own comfortable habits and opinions. A famous French writer once said, 'There are people whose clocks stop at a certain point in their lives.' I could without any trouble name a half dozen national figures resident in Washington, D.C., whom you would recognize, and I could tell you roughly the year their clock stopped.

If you are conscious of the danger of going to seed, you can resort to countervailing measures. At any age. You can keep your zest until the day you die. If I may offer you a simple maxim, 'Be interested.' Everyone wants to be interesting, but the vitalizing thing is to be interested. Keep your curiosity, your sense of wonder. Discover new things. Care. Risk. Reach out. 

Learn all your life. Learn from your failures, from your successes. I know that some of you are a little frightened - more than a little - of what's ahead. You know a lot - perhaps too much - about the ways in which lives get messed up. Bright illusions aren't your problem. But someone said, 'Life is an error-making and error-correcting process.' …Sometimes it's confusing but Irene Peter pointed out that today if you're not confused, you're not thinking clearly. 

We learn from our jobs, from our friends and families. We learn by accepting the commitments of life, by playing the roles that life hands us (not necessarily the roles we would have chosen). We learn by taking risks, by suffering, by enjoying, by loving, by bearing life's indignities with dignity.

The lessons of maturity aren't simple things such as acquiring information and skills. You learn not to engage in self-destructive behavior, not to burn up energy in anxiety. You learn to manage your tensions, if you have any, which you do. You find that self-pity and resentment are among the most toxic of drugs. You conclude that the world loves talent but pays off on character. 

…You learn to live along the way. You don't let the nagging pressures of life smother moments of beauty that can never be recaptured. Careless people treat unique moments as throwaways and live to regret it. 

Those are hard lessons to learn early in life. As a rule you have to have picked up some mileage and some dents in your fenders before you understand. As Norman Douglas said, 'There are some things you can't learn from others. You have to pass through the fire.' 

You bear with the things you can't change. You come to terms with yourself. …You master the arts of mutual dependence, meeting the needs of loved ones and letting yourself need them. You can even be unaffected - a quality that often takes years to acquire. You can achieve the simplicity that lies beyond sophistication. 

…Humans want meaning in their lives. In the stable periods of history, meaning was supplied in the context of a coherent community and traditionally prescribed patterns of culture. On being born into the society you were heir to a whole warehouse full of meanings. Today you can't count on any such heritage. People run around searching for identity, but it isn't handed out free any more - not in this transient, rootless, pluralistic society. Your identity is what you've committed yourself to. If you make no commitments, you're an unfinished person. Freedom and obligation, liberty and duty, that's the deal. It's a popular view today that the important thing is to find out who you really are, to liberate the 'real you'. But self-knowledge isn't enough. You build meaning into your life through your commitments - whether to your religion, to your conception of an ethical order, to your loved ones, to your life work, to your community. 

…The aim is that you do not suffer the contemporary fate of rootlessness and hollowness and faithlessness, that you not succumb to the ailment of the age, the tyranny of the imperious, imprisoning self. 

…One of the enemies of sound, lifelong motivation is a rather childish conception we have of the kind of concrete, describable goal toward which all of our efforts drive us. We want to believe that there is a point at which we can feel that we have arrived. We want a scoring system that tells us when we've piled up enough points to count ourselves successful.

So you scramble and sweat and climb to reach what you thought was the goal. And when you get there, you stand up and look around and chances are you feel a little empty. Maybe more than a little empty.

You wonder whether you climbed the wrong mountain.

But the metaphor is all wrong. Life isn't a mountain that has a summit. Nor is it - as some suppose - a riddle that has an answer. Nor a game that has a final score. 

Life is an endless unfolding and - if we wish it to be - an endless process of self-discovery, an endless and unpredictable dialogue between our own potentialities and the life situations in which we find ourselves. By potentialities I mean not just intellectual gifts but the full range of one's capacities for learning, sensing, wondering, understanding, loving and aspiring. 

Perhaps you think that by age 35 or 45 or even 55 you will have explored those potentialities pretty fully. Don't deceive yourself! The capacities you actually develop to the full come out as the result of an interplay between you and life's challenges - and the challenges keep coming. And the challenges keep changing. 

We are just beginning to recognize how even those who have had every advantage and opportunity unconsciously put a ceiling on their own growth, underestimate their potentialities or hide from the risk that growth involves. It is my hope that you will keep on growing, and that you will be the cause of growth in others." 

这个问题值得研究一下，我在网上查到了天津市教育招生考试院的扫描文件，用的确实是 on：

你也不要指望这些出卷的人自己写个文章出来，他们也全是在海外杂志出版物上面抄的，有时遇到难一点的词修改一下，完全是这个模式。

没想到抄都抄错了。on应是or

另外，这里的on如果表示时间，是讲不通的。