【文章內(nèi)容簡介】 produced. When a plant is under stress, its cells produce poorly folded or unfolded proteins. Then a builtin system senses this and “sets off an alarm in the cell,” said Howell. In response to the alarm, another protein (IRE1) starts working and creates a different process which activates (激活 ) the stress response genes whose products bring about defensive measures that help the plant survive. “As it turns out, responses that are activated under stress conditions actually inhibit the growth of plants,” said Howell. “This allows them to preserve their energy to survive the stress conditions.” For plants in the wild, this response is a help for survival, he said. In production of agriculture crops, however, this response reduces yields. “You don’t want crop plants to stop growing,” Howell said. “You want them to continue to grow and produce even though they are under stress.” With the new understanding of this stress response, the next step may be to silence the alarm system, said Howell. “What may be important is to disable some of these stress responses. That may make the plant more productive under stress conditions.” 28. According to the text, an alarm in the plant cells is caused by ______. A. the folded proteins B. the changed proteins C. the defensive measures D. the stress response genes 29. The energy preserved in the plants under stress conditions ______. A. helps the plants to survive B. helps to maintain high yields C. keeps the plants growing D. helps to produce proteins 30. The underlined word “inhibit” in Paragraph 5 can be replaced by “______”. A. prevent B. start C. continue D. promote 31. How does Howell intend to make crop plants maintain high yields under stress conditions? A. By making crop plants keep more energy. B. By making crop plants stop growing. C. By making the alarm system stop working. D. By making the alarm system respond quickly. D Once when I was facing a decision that involved high risk, I went to a friend. He looked at me for a moment, and then wrote a sentence containing the best advice I’ve ever had: Be bold and brave — and mighty (強大的 ) forces will e to your aid. Those words made me see clearly that when I had fallen short in the past, it was seldom because I had tried and failed. It was usually because I had let fear of failure stop me from trying at all. On the other hand, whenever I had plunged into deep water, forced by courage or circumstance, I had always been able to swim until I got my feet on the ground again. Boldness means a decision to bite off more than you can eat. And there is nothing mysterious about the mighty forces. They are potential powers we possess: energy, skill, sound judgment, creative ideas — even physical strength greater than most of us realize. Admittedly, those mighty forces are spiritual ones. But they are more important than physical ones. A college classmate of mine, Tim, was an excellent football player, even though he weighed much less than the average player. “In one game I suddenly found myself confronting a huge player, who had nothing but me between him and our goal line,” said Tim. “I was so frightened that I closed my eyes and desperately threw myself at that guy like a bullet — and stopped him cold.” Boldness — a willingness to extend yourself to the extreme—is not one that can be acquired overnight. But it can be taught to children and developed in adults. Confidence builds up. Surely, there will be setbacks (挫折 ) and disappointments in life。 boldness in itself is no guarantee of success. But the person who tries to do something and fails is a lot better off than the person who tries to do nothing and succeeds. So, always try to live a little bit beyond your abilities—and you’ll find your abilities are greater than you ever dreamed. 32. Why was the author sometimes unable to reach his goal in the past? A. He faced huge risks. B. He lacked mighty forces. C. Fear prevented him from trying. D. Failure blocked his way to success. 33. What is the implied meaning of the underlined part? A. Swallow more than you can digest. B. Act slightly above your abilities. C. Develop more mysterious powers. D. Learn to make creative decisions. 34. What can be learned from Paragraph 5? A. Confidence grows more rapidly in adults. B. Trying without success is meaningless. C. Repeated failure creates a better life. D. Boldness can be gained little by little. 35. What is the author’s purpose in writing this passage? A. To encourage people to be courageous. B. To advise people to build up physical power. C. To tell people the ways to guarantee success. D. To remend people to develop more abilities. 第二節(jié) (共 5 小題；每小題 2 分，滿分 10 分 ) 根據(jù)短文內(nèi)容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。 Instagram is a game. Getting likes and