1. (2017高一上·山东期中) 完形填空

    One day, a professor entered the classroom and asked his students to prepare for a surprise test. They waited anxiously at their desks for the test to begin. The professor1the question papers, with the text facing down as usual.2he handed them all out, he asked his students to 3 the page and begin. To everyone's surprise, there were no4 just a black dot（点) in the center of the page. The professor, seeing the expression on everyone's face, told them the following:

    "I want you to write what you5there.”

    The students,6got started on the inexplicable(费解的) task. At the end of the class, the professor 7all the answer papers and started reading each one of them aloud in front of all the students. All of them, with no8described the black dot, trying to explain its position in the middle of the sheet, etc. After all had been9 the classroom was silent, the professor began to explain:

    "I'm not going to grade (打分)this. I10wanted to give you something to think about. No one wrote about the11part of the paper. Everyone focused on the black dot, and the same happens in our12 .We have a white paper to watch and13but we always focus on the dark spots. Our life is a14 given to us with love and care and we always have15 to celebrate: nature renewing itself every day, our friends around us, the job that 16 our livelihood（生计） and the miracles （奇迹）we see every day.17 we insist on focusing only on the dark spots: the health issues that bother us, the lack of money, the18relationship with people we work with, the19 with a friend, and etc.

    The dark spots are very20compared to everything we have in our lives, but they are the ones that pollute our minds. "