D．enjoyable

　　答案：C　前面那个故事使我学到了我多年教学生涯的一个很有价值的经验教训。difficult困难的；painful痛苦的；valuable有价值的；enjoyable令人愉快的。由语境可知，这件事情让我受益颇多，自然是有价值的，故C项正确。

　　20A．early

　　B．slowly

　　C．frequently

　　D．occasionally

　　答案：A　由语境可知，西蒙的改变还不算晚，并且是朝着好的方面改变，因为这样我很感激。我无意当中的一句表扬的话语对西蒙的生活产生了如此巨大的影响。

　　.语法填空

　　(2017·贵州省六校联盟第二次联考)

　　Alfred Alder, a famous psychiatrist, had __1__ interesting experience. When he was a small boy he got off to a poor start in arithmetic(算术). His teacher got the idea that he had no ability in arithmetic, and told his parents __2__ she thought in order that they would not expect too much of him. In this way, they too developed the idea, “Isn't __3__ too bad that Alfred can't do arithmetic？” He accepted their mistaken estimate of his ability, __4__(feel) that it was useless to try, and that he was very poor at arithmetic, just as they expected.

　　One day he became very angry at the teacher and the other students because they laughed when he said he saw how to do a problem which none of the other students had been able to solve.

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